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Segment and Geographic Data - Narrative (Details)	6 Months Ended
Segment and Geographic Data - Narrative (Details)	Mar. 29, 2025 segment
Segment Reporting [Abstract]
Number of reportable segments	2
Number of operating segments	2

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Pay vs Performance Disclosure
Consolidated net income (loss)	$ (41)	$ 14	$ (101)	$ 6

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Segment and Geographic Data

6 Months Ended

Mar. 29, 2025

Segment Reporting [Abstract]

Segment and Geographic Data

The Company’s operations are organized into two operating and reportable segments: Americas and Rest of World. The structure is designed to align us with our customers, provide improved service, drive future growth, and to facilitate synergy realization.

Selected information by reportable segment is presented in the following tables:


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Net Sales
Americas	$	473	$	375	$	893	$	723
Rest of World	351		183		633		354
Total net sales	$	824	$	558	$	1,526	$	1,077

Operating income (loss)
Americas	$	8	$	20	$	1	$	17
Rest of World	(4)		1		(19)		(8)
Total operating income (loss)	$	4	$	21	$	(18)	$	9

Depreciation and amortization
Americas	$	39	$	31	$	72	$	61
Rest of World	19		13		39		27
Total depreciation and amortization	$	58	$	44	$	111	$	88

Selected information by geographical region is presented in the following table:


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Net Sales
United States and Canada	$	367	$	251	$	673	$	475
Latin America	106		124		$	220	$	248
Rest of World	351		183		633		354
Total net sales	$	824	$	558	$	1,526	$	1,077

Selected information by category is presented in the following tables:


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Net Sales
Personal Care	50	%	64	%	52	%	64	%
Consumer Solutions	50	%	36	%	48	%	36	%

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 29, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Transaction and Other Activities - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Restructuring Reserve [Roll Forward]
Balance at September 28, 2024			$ 8
Charges	$ 23	$ 4	55	$ 14
Non-cash items			(4)
Cash payments			(52)
Balance at March 29, 2025	7		7
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Balance at September 28, 2024			8
Charges			10
Non-cash items			0
Cash payments			(11)
Balance at March 29, 2025	7		7
Transaction Activities
Restructuring Reserve [Roll Forward]
Balance at September 28, 2024			0
Charges			24
Non-cash items			0
Cash payments			(24)
Balance at March 29, 2025	0		0
Transaction bonuses			19
Non-cash Charges
Restructuring Reserve [Roll Forward]
Balance at September 28, 2024			0
Charges			4
Non-cash items			(4)
Cash payments			0
Balance at March 29, 2025	0		0
Other Activities
Restructuring Reserve [Roll Forward]
Balance at September 28, 2024			0
Charges			17
Non-cash items			0
Cash payments			(17)
Balance at March 29, 2025	$ 0		$ 0

Segment and Geographic Data - Schedule of Financial and Other Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Segment Reporting Information [Line Items]
Net sales	$ 824	$ 558	$ 1,526	$ 1,077
Operating income (loss)	4	21	(18)	9
Depreciation and amortization	58	44	111	88
Americas
Segment Reporting Information [Line Items]
Net sales	473	375	893	723
Operating income (loss)	8	20	1	17
Depreciation and amortization	39	31	72	61
Rest of World
Segment Reporting Information [Line Items]
Net sales	351	183	633	354
Operating income (loss)	(4)	1	(19)	(8)
Depreciation and amortization	$ 19	$ 13	$ 39	$ 27

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details

Financial Instruments and Fair Value Measurements (Tables)

6 Months Ended

Mar. 29, 2025

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Derivatives and Location on Consolidated Balance Sheets

The Company records the fair value positions of all derivative financial instruments on a net basis by counterparty for which a master netting arrangement is utilized. Balances on a gross basis are as follows:

Derivative Instruments

Hedge Designation

Balance Sheet Location

March 29, 2025

September 28, 2024

Cross-currency swaps

Designated

Other long-term liabilities

(38)

—

Schedule of Income or (Loss) from Derivative Instruments

The effect of the Company’s derivative instruments on the Consolidated and Combined Statements of Operations is as follows:


		Quarterly Period Ended				Two Quarterly Periods Ended
Derivative Instruments	Statements of Income Location	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Cross-currency swaps	Interest expense	$	3	$	—	$	5	$	—

Schedule of Assets Measured at Fair Value on Non-recurring Basis

Included in the following tables are the major categories of assets and their current carrying values, along with the impairment loss recognized on the fair value measurement for the period then ended:


	March 29, 2025
	Level 1		Level 2		Level 3		Total		Impairment
Indefinite-lived trademarks	$	—	$	—	$	26	$	26	$	—
Goodwill	—		—		643		643		—
Definite lived intangible assets	—		—		221		221		—
Property, plant, and equipment	—		—		1,519		1,519		—
Total	$	—	$	—	$	2,409	$	2,409	$	—


	September 28, 2024
	Level 1		Level 2		Level 3		Total		Impairment
Indefinite-lived trademarks	$	—	$	—	$	26	$	26	$	—
Goodwill	—		—		624		624		(171)
Definite lived intangible assets	—		—		200		200		(1)
Property, plant, and equipment	—		—		949		949		—
Total	$	—	$	—	$	1,799	$	1,799	$	(172)

Leases

6 Months Ended

Mar. 29, 2025

Leases [Abstract]

Leases

The Company leases certain manufacturing facilities, warehouses, office space, manufacturing equipment, office equipment, and automobiles.

Supplemental lease information is as follows:


Leases	Classification	March 29, 2025		September 28, 2024
Operating leases:
Operating lease right-of-use assets	Right-of-use asset	$	71	$	49
Current operating lease liabilities	Accrued expenses	18		11
Noncurrent operating lease liabilities	Operating lease liability	55		39
Finance leases:
Finance lease right-of-use assets	Property, plant, and equipment, net	$	—	$	6

Leases

The Company leases certain manufacturing facilities, warehouses, office space, manufacturing equipment, office equipment, and automobiles.

Supplemental lease information is as follows:


Leases	Classification	March 29, 2025		September 28, 2024
Operating leases:
Operating lease right-of-use assets	Right-of-use asset	$	71	$	49
Current operating lease liabilities	Accrued expenses	18		11
Noncurrent operating lease liabilities	Operating lease liability	55		39
Finance leases:
Finance lease right-of-use assets	Property, plant, and equipment, net	$	—	$	6

Segment and Geographic Data - Schedule of Selected Information by Geographical Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Segment Reporting Information [Line Items]
Net sales	$ 824	$ 558	$ 1,526	$ 1,077
United States and Canada
Segment Reporting Information [Line Items]
Net sales	367	251	673	475
Latin America
Segment Reporting Information [Line Items]
Net sales	106	124	220	248
Rest of World
Segment Reporting Information [Line Items]
Net sales	$ 351	$ 183	$ 633	$ 354

- Definition

+ References

+ Details

Leases (Details) - USD ($) $ in Millions	Mar. 29, 2025	Sep. 28, 2024
Operating leases:
Operating lease right-of-use assets	$ 71	$ 49
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses	Accrued expenses
Current operating lease liabilities	$ 18	$ 11
Noncurrent operating lease liabilities	$ 55	$ 39
Finance leases:
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment	Property, plant and equipment
Finance lease right-of-use assets	$ 0	$ 6

Acquisition - Narrative (Details) - GLT Acquisition - Berry Global Group, Inc. - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Asset Acquisition [Line Items]
Business acquisition, pro forma net sales	$ 885	$ 1,638	$ 1,725
Business acquisition, pro forma loss	$ 25	$ 110	$ 60

Cover - shares shares in Millions	6 Months Ended
Cover - shares shares in Millions	Mar. 29, 2025	May 07, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 29, 2025
Document Transition Report	false
Entity Address, Address Line One	9335 Harris Corners Pkwy
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28269
City Area Code	866
Local Phone Number	744-7380
Entity File Number	1-03560
Entity Registrant Name	Magnera Corporation
Entity Tax Identification Number	23-0628360
Entity Incorporation, State or Country Code	PA
Title of 12(b) Security	Common Stock
Trading Symbol	MAGN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		35.6
Amendment Flag	false
Entity Central Index Key	0000041719
Current Fiscal Year End Date	--09-27
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2025
Former Address
Document Information [Line Items]
Entity Address, Address Line One	4350 Congress Street
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28209

Long-Term Debt - Narrative (Details) - USD ($) $ in Millions	Mar. 29, 2025	Nov. 04, 2024
Term Loan \| Line of Credit
Debt Instrument [Line Items]
Debt instrument		$ 785
7.25% First Priority Senior Secured Notes \| Senior Notes
Debt Instrument [Line Items]
Debt instrument		$ 800
Interest rate on debt (as a percent)	7.25%	7.25%
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Debt instrument		$ 350
4.75% First Priority Senior Secured Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	4.75%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Acquisition

6 Months Ended

Mar. 29, 2025

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

Acquisition

Glatfelter

The Transaction combined GLT’s sustainable solutions and product portfolio with Treasure’s proprietary technologies and global scale. The Company is now a global leader in growing markets while serving some of the world’s largest brand owners. The results of GLT have been included in the consolidated results of the Company since the Closing Date.

The GLT acquisition has been accounted for under the purchase method of accounting. Under this method, the assets acquired and liabilities assumed have been recorded based on estimated fair values as of the Closing Date. Certain assets, including inventory, intangibles, and property, plant, and equipment included in the purchase price allocation have been estimated based on historical acquisitions. The Company will have a full valuation analysis performed over the acquired business during subsequent quarters and will continue to update the purchase price allocation throughout the year. The Company has recognized goodwill on this Transaction primarily as a result of expected cost synergies, and expects goodwill not to be deductible for tax purposes.

The following table summarizes the purchase price allocation, which is preliminary and subject to change within one year of the Closing Date:


Fair value of GLT common stock concurrent with closing	$	74

Identifiable assets acquired and liabilities assumed
Cash	37
Working capital(a)	247
Property, plant and equipment	637
Identifiable intangible assets	51
Other assets	74
Other long-term liabilities	(132)
Debt	(869)
Goodwill	29
Total consideration	$	74

(a) Includes a $12 million step up of inventory to fair value

When including GLT results for the periods prior to the Closing Date, unaudited pro forma net sales and net loss were $885 million and $25 million, respectively for the quarterly period ended March 30, 2024, $1,638 million and $110 million, respectively, for the two quarterly periods ended March 29, 2025, and $1,725 million and $60 million, respectively, for the two quarterly periods ended March 30, 2024. The unaudited pro forma net sales and net income figures assume that the Transaction was consummated as of the beginning of the relevant period.

Segment and Geographic Data - Schedule of Selected Information by Product Line (Details) - Product Concentration Risk - Revenue Benchmark	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Personal Care
Segment Reporting Information [Line Items]
Concentration risk percentage	50.00%	64.00%	52.00%	64.00%
Consumer Solutions
Segment Reporting Information [Line Items]
Concentration risk percentage	50.00%	36.00%	48.00%	36.00%

Basis of Presentation (Details)	Nov. 04, 2024
Magnera Corporation \| Treasure Shareholders
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest	90.00%
Magnera Corporation \| Glatfelter Shareholders
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest	10.00%
Treasure Holdco, Inc. \| Berry Global Group, Inc.
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest	0.00%

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Mar. 29, 2025	Nov. 04, 2024	Sep. 28, 2024
Debt Instrument [Line Items]
Debt discounts, deferred fees and other	$ (85)		$ 0
Total long-term debt	1,998		0
Current portion of long-term debt	(8)		0
Long-term debt, less current portion	1,990		0
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	0		0
Term Loan \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 783		0
7.25% First Priority Senior Secured Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	7.25%	7.25%
Long-term debt, gross	$ 800		0
4.75% First Priority Senior Secured Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	4.75%
Long-term debt, gross	$ 500		$ 0

Financial Instruments and Fair Value Measurements - Schedule of Fair Value of Derivatives and Location on Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Mar. 29, 2025	Sep. 28, 2024
Cross-currency swaps \| Designated as Hedging
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of derivative instruments	$ (38)	$ 0

Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - GLT Acquisition - Berry Global Group, Inc. $ in Millions	Nov. 04, 2024 USD ($)
Asset Acquisition [Line Items]
Fair value of GLT common stock concurrent with closing	$ 74
Identifiable assets acquired and liabilities assumed
Cash	37
Working capital	247
Property, plant and equipment	637
Identifiable intangible assets	51
Other assets	74
Other long-term liabilities	(132)
Debt	(869)
Goodwill	29
Total consideration	74
Inventory step up	$ 12

Consolidated and Combined Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (41)	$ 14	$ (101)	$ 6
Other comprehensive income, net of tax:
Currency translation gain (loss)	25	(21)	(46)	18
Other comprehensive income (loss)	25	(21)	(46)	18
Comprehensive income (loss)	$ (16)	$ (7)	$ (147)	$ 24

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Long-Term Debt

6 Months Ended

Mar. 29, 2025

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt consists of the following:


Facility	Maturity Date	March 29, 2025		September 28, 2024
Revolving Credit Facility	November 2029	$	—	$	—
Term Loan	November 2031	783		—
7.25% First Priority Senior Secured Notes	November 2031	800		—
4.75% First Priority Senior Secured Notes	October 2029	500		—
Debt discounts, deferred fees and other		(85)		—
Total long-term debt		1,998		—
Current portion of long-term debt		(8)		—
Long-term debt, less current portion		$	1,990	$	—

As part of the Transaction, the Company consummated a $785 million Term Loan due 2031 (the “Term Loan”), an $800 million issuance of 7.25% First Priority Senior Secured Notes due 2031 (the “7.25% Notes”), and a $350 million revolving credit facility (the “Revolving Credit Facility”). The proceeds from the Term Loan and 7.25% Notes were used to retire a portion of GLT outstanding debt and fund a cash distribution to Berry.

Despite not having financial maintenance covenants on our Term Loan and secured notes, these agreements do contain certain negative covenants. The failure to comply with these negative covenants could restrict our ability to incur additional indebtedness, effect acquisitions, enter into certain significant business combinations, make distributions or redeem indebtedness. The current portion of long-term debt consists of quarterly principal payments on the term loan due within one year. We are in compliance with all covenants as of March 29, 2025.

Debt discounts, deferred financing fees and the purchase price adjustment related to the retained GLT 4.75% First Priority Senior Secured Notes are presented net of Long-term debt, less the current portion on the Consolidated and Combined Balance Sheets and are amortized to Interest expense on the Consolidated and Combined Statements of Operations through maturity.

Contingencies and Commitments (Details) $ in Millions	6 Months Ended
Contingencies and Commitments (Details) $ in Millions	Mar. 29, 2025 USD ($)	Mar. 30, 2024 USD ($)
Loss Contingencies [Line Items]
Agreement term for environmental remediation (in years)	30 years
Accrual for environmental loss contingencies	$ 14
Escrow asset	$ 9
Previous Acquisition
Loss Contingencies [Line Items]
Deferred consideration accretion rate	0.095
Deferred consideration	$ 53	$ 55

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Acquisition (Tables)

6 Months Ended

Mar. 29, 2025

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table summarizes the purchase price allocation, which is preliminary and subject to change within one year of the Closing Date:


Fair value of GLT common stock concurrent with closing	$	74

Identifiable assets acquired and liabilities assumed
Cash	37
Working capital(a)	247
Property, plant and equipment	637
Identifiable intangible assets	51
Other assets	74
Other long-term liabilities	(132)
Debt	(869)
Goodwill	29
Total consideration	$	74

(a) Includes a $12 million step up of inventory to fair value

Consolidated and Combined Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Cash Flows from Operating Activities:
Net income (loss)	$ (101)	$ 6
Adjustments to reconcile net cash from operating activities:
Depreciation	83	63
Amortization of intangibles	28	24
Non-cash interest expense	8	3
Deferred income tax	10	1
Share-based compensation expense	10	5
Other non-cash operating activities, net	37	2
Changes in working capital, net	(78)	(112)
Change in other assets and liabilities	10	1
Net cash from (used in) operating activities	7	(7)
Cash Flows from Investing Activities:
Additions to property, plant and equipment, net	(39)	(41)
Cash acquired from GLT acquisition	37	0
Settlement of net investment hedges	22	0
Other investing activities and other	0	28
Net cash from (used in) investing activities	20	(13)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	1,556	0
Repayments on long-term borrowings	(432)	(1)
Transfers from (to) Berry, net	34	8
Cash distribution to Berry	(1,111)	0
Debt fees	(15)	0
Net cash from financing activities	32	7
Effect of currency translation on cash	(7)	2
Net change in cash and cash equivalents	52	(11)
Cash and cash equivalents at beginning of period	230	185
Cash and cash equivalents at the end of period	$ 282	$ 174

Financial Instruments and Fair Value Measurements - Schedule of Assets Measured at Fair Value on Non-recurring Basis (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 29, 2025	Sep. 28, 2024
Impairment
Total		$ (172)
Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	$ 26	26
Goodwill	643	624
Definite lived intangible assets	221	200
Property, plant, and equipment	1,519	949
Total	2,409	1,799
Impairment
Indefinite-lived trademarks	0	0
Goodwill	0	(171)
Definite lived intangible assets	0	(1)
Property, plant, and equipment	0	0
Total	0	(172)
Level 1 \| Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	0	0
Goodwill	0	0
Definite lived intangible assets	0	0
Property, plant, and equipment	0	0
Total	0	0
Level 2 \| Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	0	0
Goodwill	0	0
Definite lived intangible assets	0	0
Property, plant, and equipment	0	0
Total	0	0
Level 3 \| Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	26	26
Goodwill	643	624
Definite lived intangible assets	221	200
Property, plant, and equipment	1,519	949
Total	$ 2,409	$ 1,799

Leases (Tables)

6 Months Ended

Mar. 29, 2025

Leases [Abstract]

Schedule of Information Related to Leases

Supplemental lease information is as follows:


Leases	Classification	March 29, 2025		September 28, 2024
Operating leases:
Operating lease right-of-use assets	Right-of-use asset	$	71	$	49
Current operating lease liabilities	Accrued expenses	18		11
Noncurrent operating lease liabilities	Operating lease liability	55		39
Finance leases:
Finance lease right-of-use assets	Property, plant, and equipment, net	$	—	$	6

Transaction and Other Activities

6 Months Ended

Mar. 29, 2025

Restructuring and Related Activities [Abstract]

Transaction and Other Activities

The table below sets forth the significant components of the Transaction and other activities, including supply chain financings activity charges recognized for the periods presented, by reportable segment:


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Americas	$	14	$	3	$	34	$	6
Rest of World	9		1		21		8
Consolidated	$	23	$	4	$	55	$	14

The table below sets forth the activity with respect to the transaction and other activities accrual at March 29, 2025:


	Employee Severance and Benefits (a)		Transaction Activities (b)		Non-cash Charges		Other Activities		Total
Balance at September 28, 2024	$	8	$	—	$	—	$	—	$	8
Charges	10		24		4		17		55
Non-cash items	—		—		(4)		—		(4)
Cash payments	(11)		(24)		—		(17)		(52)
Balance at March 29, 2025	$	7	$	—	$	—	$	—	$	7

(a) Restructuring activities

(b) Includes $19 million of Transaction related compensation

Segment and Geographic Data (Tables)

6 Months Ended

Mar. 29, 2025

Segment Reporting [Abstract]

Schedule of Financial and Other Information by Segment

Selected information by reportable segment is presented in the following tables:


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Net Sales
Americas	$	473	$	375	$	893	$	723
Rest of World	351		183		633		354
Total net sales	$	824	$	558	$	1,526	$	1,077

Operating income (loss)
Americas	$	8	$	20	$	1	$	17
Rest of World	(4)		1		(19)		(8)
Total operating income (loss)	$	4	$	21	$	(18)	$	9

Depreciation and amortization
Americas	$	39	$	31	$	72	$	61
Rest of World	19		13		39		27
Total depreciation and amortization	$	58	$	44	$	111	$	88

Schedule of Selected Information by Geographical Region

Selected information by geographical region is presented in the following table:


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Net Sales
United States and Canada	$	367	$	251	$	673	$	475
Latin America	106		124		$	220	$	248
Rest of World	351		183		633		354
Total net sales	$	824	$	558	$	1,526	$	1,077

Schedule of Selected Information by Product Line

Selected information by category is presented in the following tables:


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Net Sales
Personal Care	50	%	64	%	52	%	64	%
Consumer Solutions	50	%	36	%	48	%	36	%

Long-Term Debt (Tables)

6 Months Ended

Mar. 29, 2025

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consists of the following:


Facility	Maturity Date	March 29, 2025		September 28, 2024
Revolving Credit Facility	November 2029	$	—	$	—
Term Loan	November 2031	783		—
7.25% First Priority Senior Secured Notes	November 2031	800		—
4.75% First Priority Senior Secured Notes	October 2029	500		—
Debt discounts, deferred fees and other		(85)		—
Total long-term debt		1,998		—
Current portion of long-term debt		(8)		—
Long-term debt, less current portion		$	1,990	$	—

Financial Instruments and Fair Value Measurements

6 Months Ended

Mar. 29, 2025

Fair Value Disclosures [Abstract]

Financial Instruments and Fair Value Measurements

In the normal course of business, the Company is exposed to certain risks arising from business operations and economic factors. The Company may use derivative financial instruments to help manage market risk and reduce the exposure to fluctuations in foreign currencies. These financial instruments are not used for trading or other speculative purposes.

Cross-Currency Swaps

The Company is party to certain cross-currency swaps to hedge a portion of our foreign currency risk. During the quarter ended March 29, 2025, the Company received net proceeds of $22 million related to the settlement of existing cross-currency rate swaps, with the offset being recorded in Accumulated other comprehensive loss. Following the settlement, the Company entered into a €250 million and a €425 million cross-currency swap, maturing November 2027 and November 2029 respectively. The swaps are designated as a hedge of the Company’s foreign currency investment in foreign subsidiaries.

Derivative Instruments

Hedge Designation

Balance Sheet Location

March 29, 2025

September 28, 2024

Cross-currency swaps

Designated

Other long-term liabilities

(38)

—

The effect of the Company’s derivative instruments on the Consolidated and Combined Statements of Operations is as follows:


		Quarterly Period Ended				Two Quarterly Periods Ended
Derivative Instruments	Statements of Income Location	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Cross-currency swaps	Interest expense	$	3	$	—	$	5	$	—

Non-recurring Fair Value Measurements

The Company has certain assets that are measured at fair value on a non-recurring basis when impairment indicators are present or when the Company completes an acquisition. The Company adjusts certain long-lived assets to fair value only when the carrying values exceed the fair values. The categorization of the framework used to value the assets is considered Level 3, due to the subjective nature of the unobservable inputs used to determine the fair value. These assets that are subject to our impairment analysis primarily include our definite lived and indefinite lived intangible assets, including Goodwill and our Property, plant and equipment. The Company reviews Goodwill and other indefinite lived assets for impairment as of the first day of the fourth fiscal quarter each year and more frequently if impairment indicators exist. As a result of the fiscal 2024 assessment, the Company recorded an impairment charge of $172 million. No impairment indicators were identified in the current quarter.


	March 29, 2025
	Level 1		Level 2		Level 3		Total		Impairment
Indefinite-lived trademarks	$	—	$	—	$	26	$	26	$	—
Goodwill	—		—		643		643		—
Definite lived intangible assets	—		—		221		221		—
Property, plant, and equipment	—		—		1,519		1,519		—
Total	$	—	$	—	$	2,409	$	2,409	$	—


	September 28, 2024
	Level 1		Level 2		Level 3		Total		Impairment
Indefinite-lived trademarks	$	—	$	—	$	26	$	26	$	—
Goodwill	—		—		624		624		(171)
Definite lived intangible assets	—		—		200		200		(1)
Property, plant, and equipment	—		—		949		949		—
Total	$	—	$	—	$	1,799	$	1,799	$	(172)

The Company’s financial instruments consist primarily of cash and cash equivalents, long-term debt, cross-currency swap agreements, and finance lease obligations. The book value of our marketable long-term indebtedness exceeded fair value by $77 million as of March 29, 2025. The Company’s long-term debt fair values were determined using Level 2 inputs (substantially observable).

Financial Instruments and Fair Value Measurements - Schedule of Income or (Loss) from Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Cross-currency swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest expense	$ 3	$ 0	$ 5	$ 0

Consolidated and Combined Statements of Changes in Stockholders’ Equity - USD ($) $ in Millions	Total	Berry Net Investment	Additional Paid-in Capital	Other Comprehensive Income (Loss) - Currency Translation	Retained Loss
Beginning balance at Sep. 30, 2023	$ 2,390	$ 2,561	$ 0	$ (171)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6	6
Other comprehensive income (loss)	18			18
Transfers from parent, net	16	16
Ending balance at Mar. 30, 2024	2,430	2,583	0	(153)	0
Beginning balance at Dec. 30, 2023	2,416	2,548	0	(132)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	14	14
Other comprehensive income (loss)	(21)			(21)
Transfers from parent, net	21	21
Ending balance at Mar. 30, 2024	2,430	2,583	0	(153)	0
Beginning balance at Sep. 28, 2024	2,139	2,307	0	(168)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(101)				(101)
Other comprehensive income (loss)	(46)			(46)
Transfers from parent, net	(1,111)	(1,111)
October net investment	129	129
Distribution of Berry’s net investment	0	(1,325)	1,325
Acquisition of GLT	74		74
Share-based compensation	10		10
Other	(1)		(1)
Ending balance at Mar. 29, 2025	1,093	0	1,408	(214)	(101)
Beginning balance at Dec. 28, 2024	1,106	0	1,405	(239)	(60)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(41)				(41)
Other comprehensive income (loss)	25			25
Share-based compensation	4		4
Other	(1)		(1)
Ending balance at Mar. 29, 2025	$ 1,093	$ 0	$ 1,408	$ (214)	$ (101)

Corporate Expense Allocation	6 Months Ended
Corporate Expense Allocation	Mar. 29, 2025
Corporate Expense Allocations [Abstract]
Corporate Expense Allocation	Corporate Expense AllocationBased on management estimates, $3 million and $9 million of general corporate expenses including information technology, accounting, legal, human resources, and other services were allocated to Treasure periods prior to the Closing Date during the six months ended March 29, 2025 and March 30, 2024, respectively.

Consolidated and Combined Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Income Statement [Abstract]
Net sales	$ 824	$ 558	$ 1,526	$ 1,077
Costs and expenses:
Cost of goods sold	736	488	1,367	965
Selling, general and administrative	47	28	91	56
Amortization of intangibles	14	12	28	24
Transaction and other activities	23	4	55	14
Corporate expense allocation	0	5	3	9
Operating income (loss)	4	21	(18)	9
Other expense (income), net	5	1	26	(1)
Interest expense	39	2	65	2
Income (loss) before income taxes	(40)	18	(109)	8
Income tax benefit	1	4	(8)	2
Net income (loss)	$ (41)	$ 14	$ (101)	$ 6
Net income (loss) per share:
Basic (in dollars per share)	$ (1.15)	$ 0.44	$ (2.85)	$ 0.19
Diluted (in dollars per share)	$ (1.15)	$ 0.44	$ (2.85)	$ 0.19

Transaction and Other Activities - Schedule of Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Restructuring Cost And Reserve [Line Items]
Charges	$ 23	$ 4	$ 55	$ 14
Americas
Restructuring Cost And Reserve [Line Items]
Charges	14	3	34	6
Rest of World
Restructuring Cost And Reserve [Line Items]
Charges	$ 9	$ 1	$ 21	$ 8

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Corporate Expense Allocation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Corporate Expense Allocations [Line Items]
Corporate expense allocation	$ 0	$ 5	$ 3	$ 9
Treasure Holdco, Inc.
Corporate Expense Allocations [Line Items]
Corporate expense allocation			$ 3	$ 9

Basis of Presentation	6 Months Ended
Basis of Presentation	Mar. 29, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation On November 4, 2024 (the “Closing Date”), Treasure Holdco, Inc. (“Treasure”), which was a wholly owned subsidiary of Berry Global Group, Inc. (“Berry”), completed its merger (the “Transaction”) with the Glatfelter Corporation (“GLT”) which concurrently changed its name to Magnera Corporation (the “Company,” “we,” or “Magnera”). As a result, pre-Transaction Treasure shareholders received shares of Magnera representing 90% of the combined company and GLT shareholders retained 10%. As Treasure was identified as the accounting acquirer, the prior year presentation represents standalone Treasure results with the acquisition method of accounting being applied to the assets acquired and liabilities assumed of GLT. See Note 3—Acquisition. The accompanying unaudited Consolidated and Combined Financial Statements of Magnera Corporation have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim reporting. In preparing financial statements in conformity with GAAP, we must make estimates and assumptions that affect the reported amounts and disclosures at the date of the financial statements and during the reporting period. Actual results could differ from those estimates. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included, and all subsequent events up to the time of the filing have been evaluated. For further information, refer to the Company’s Form 8-K/A filed on January 31, 2025 with the SEC. The pre-Transaction combined financial results of operations, financial position, and cash flows have been prepared on a carve-out basis, which include assumptions underlying the preparation that management believe are reasonable. However, the combined pre-Transaction financial information included herein may not necessarily reflect the Company’s results of operations, financial position, and cash flows had the Company been an independent stand-alone company during the periods presented. For periods prior to the Closing Date, transactions between Berry and Treasure were reflected as a component of Berry's net investment in the Consolidated and Combined Balance Sheets and as a financing activity within the accompanying Consolidated and Combined Statements of Cash Flows. Berry's net investment on the Consolidated and Combined Balance Sheet and Consolidated and Combined Statement of Stockholders’ Equity represents the cumulative net investment by Berry in Treasure. Concurrent with the closing of the Transaction, Berry received a cash distribution and, in turn, transferred Berry’s health, hygiene and specialties global nonwovens and films business to Treasure. As a result, Berry's net investment in Treasure was reduced to zero with a corresponding adjustment to Additional Paid-in Capital. Recently Issued Accounting Pronouncements In 2023, the Financial Accounting Standards Board ("FASB") issued guidance with the goal of providing more information about reportable segments, including disaggregated expense information. The Company adopted all required disclosures requirements in fiscal 2025. In 2023, the FASB issued guidance with the goal of providing more information in the income tax reconciliation table and regarding income taxes paid. The Company is currently evaluating the impact of adopting this guidance. In 2024, the FASB issued guidance with the goal of providing more expense information of certain categories of expenses that are included in line items on the face of the statements of earnings. The Company is currently evaluating the impact of adopting this guidance.

Financial Instruments and Fair Value Measurements - Narrative (Details) € in Millions, $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Mar. 29, 2025 EUR (€)	Mar. 29, 2025 USD ($)	Mar. 30, 2024 USD ($)	Sep. 28, 2024 USD ($)	Mar. 29, 2025 EUR (€)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Settlement of net investment hedges \| $		$ 22	$ 0
Impairment charges \| $				$ 172
Fair value of long-term indebtedness greater/(less) than book value \| $		$ 77
Cross-currency swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Settlement of net investment hedges \| €	€ 22
Cross-Currency Swap Maturing November 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative notional amount \| €					€ 250
Cross-Currency Swap Maturing November 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative notional amount \| €					€ 425

Basic and Diluted Net Income (Loss) Per Share (Tables)

6 Months Ended

Mar. 29, 2025

Earnings Per Share [Abstract]

Schedule of Details of Basic and Diluted Earnings Per Share (EPS)

The following tables provide a reconciliation of the numerator and denominator of the basic and diluted EPS calculations:


	Quarterly Period Ended				Two Quarterly Periods Ended
(in millions, except share amounts)	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Numerator
Consolidated net income (loss)	$	(41)	$	14	$	(101)	$	6
Denominator
Weighted average common shares outstanding - basic and dilutive	35.6		31.8		35.5		31.8

Basic and Diluted Net Income (Loss) Per Share

6 Months Ended

Mar. 29, 2025

Earnings Per Share [Abstract]

Basic and Diluted Net Income (Loss) Per Share

Basic net income or earnings per share ("EPS") is calculated by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration for common stock equivalents.

The following tables provide a reconciliation of the numerator and denominator of the basic and diluted EPS calculations:


	Quarterly Period Ended				Two Quarterly Periods Ended
(in millions, except share amounts)	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Numerator
Consolidated net income (loss)	$	(41)	$	14	$	(101)	$	6
Denominator
Weighted average common shares outstanding - basic and dilutive	35.6		31.8		35.5		31.8

While there were no shares outstanding in prior periods, an allocation of 90% of the shares as of the completion of the Transaction have been provided for comparability purposes. Shares excluded from the current period calculation, as the effect of their conversion into shares of our common stock would be antidilutive were 1.1 million.

Contingencies and Commitments	6 Months Ended
Contingencies and Commitments	Mar. 29, 2025
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments Litigation The Company is party to various legal proceedings involving routine claims which are incidental to its business. Although the Company’s legal and financial liability with respect to such proceedings cannot be estimated with certainty, the Company believes that any ultimate liability would not be material to its consolidated and combined financial position, results of operations or cash flows. Environmental Claims Over the next 30 years, we are primarily responsible for the reimbursement of government oversight costs associated with certain environmental claims regarding the Fox River located in Neenah, Wisconsin. At March 29, 2025, the outstanding balance of the environmental liability and corresponding escrow asset was $14 million and $9 million, respectively. Tax Claims As part of a previous acquisition, the Company acquired a liability related to certain tax claims treated as a deferred purchase price (the “Deferred Consideration”). The Deferred Consideration accretes at a rate of 9.5% per annum compounded daily, which shall be paid to the selling stockholders of the previous acquisition to the extent certain existing and potential tax claims are resolved. At March 29, 2025 and March 30, 2024, the outstanding balance of the Deferred Consideration was $53 million and $55 million, respectively. If the Company incurs actual tax liability with respect to the tax claims, the amount of the Deferred Consideration owed to the selling stockholders will be reduced by the amount of such actual tax liability. The Company will be responsible for any actual tax liability in excess of the Deferred Consideration. The Deferred Consideration is reflected on the consolidated and combined balance sheets in Other long-term liabilities as the settlement of existing and potential claims is expected to be greater than one year.

Consolidated and Combined Balance Sheets - USD ($) $ in Millions	Mar. 29, 2025	Sep. 28, 2024
Current assets:
Cash and cash equivalents	$ 282	$ 230
Accounts receivable	492	359
Finished goods	310	156
Raw materials	198	103
Prepaid expenses and other current assets	146	38
Total current assets	1,428	886
Noncurrent assets:
Property, plant and equipment	1,519	949
Goodwill and intangible assets	890	850
Right-of-use assets	71	49
Other assets	153	73
Total assets	4,061	2,807
Current liabilities:
Accounts payable	379	295
Accrued expenses	209	162
Current portion of long-term debt	8	0
Total current liabilities	596	457
Noncurrent liabilities:
Long-term debt	1,990	0
Deferred income taxes	101	78
Operating lease liabilities	55	39
Other long-term liabilities	226	94
Total liabilities	2,968	668
Stockholders’ equity:
Berry net investment	0	2,307
Additional paid-in capital	1,408	0
Retained loss	(101)	0
Accumulated other comprehensive loss	(214)	(168)
Total stockholders’ equity	1,093	2,139
Total liabilities and stockholders’ equity	$ 4,061	$ 2,807

Basic and Diluted Net Income (Loss) Per Share (Details) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025 USD ($) shares	Mar. 30, 2024 USD ($) shares	Mar. 29, 2025 USD ($) shares	Mar. 30, 2024 USD ($) shares	Nov. 04, 2024
Numerator
Consolidated net income (loss) \| $	$ (41)	$ 14	$ (101)	$ 6
Denominator
Weighted average common shares outstanding - basic (in shares)	35.6	31.8	35.5	31.8
Weighted average common shares outstanding - dilutive (in shares)	35.6	31.8	35.5	31.8
Percent of shares outstanding allocated					0.90
Potential common shares (in shares)			1.1

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Revenue and Accounts Receivable	6 Months Ended
Revenue and Accounts Receivable	Mar. 29, 2025
Disaggregation of Revenue [Abstract]
Revenue and Accounts Receivable	Revenue and Accounts Receivable Revenue is recognized when performance obligations are satisfied, in an amount reflecting the consideration to which the Company expects to be entitled. We consider the promise to transfer products to be our sole performance obligation. Generally, our revenue is recognized for standard promised goods at the time of shipment, when title and risk of loss pass to the customer. The Company disaggregates revenue based on geography. See Note 9—Segment and Geographic Data. The Company records current expected credit losses based on a variety of factors including historical loss experience and current customer financial condition. The changes to our current expected credit losses, write-off activity, and recoveries were not material for any of the periods presented. The Company has entered into various factoring agreements, primarily customer-based supply chain financing programs, to sell certain receivables to third-party financial institutions. These agreements result in true sales of the transferred receivables, which occur when receivables are transferred without recourse to the Company, are reflected as a reduction of trade receivables, net on the consolidated and combined balance sheets and the proceeds are included in the cash flows from operating activities in the consolidated and combined statements of cash flows.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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+ Details

Transaction and Other Activities (Tables)

6 Months Ended

Mar. 29, 2025

Restructuring and Related Activities [Abstract]

Schedule of Restructuring and Related Costs


	Quarterly Period Ended				Two Quarterly Periods Ended
	March 29, 2025		March 30, 2024		March 29, 2025		March 30, 2024
Americas	$	14	$	3	$	34	$	6
Rest of World	9		1		21		8
Consolidated	$	23	$	4	$	55	$	14

Schedule of Restructuring Reserve by Type of Cost

The table below sets forth the activity with respect to the transaction and other activities accrual at March 29, 2025:


	Employee Severance and Benefits (a)		Transaction Activities (b)		Non-cash Charges		Other Activities		Total
Balance at September 28, 2024	$	8	$	—	$	—	$	—	$	8
Charges	10		24		4		17		55
Non-cash items	—		—		(4)		—		(4)
Cash payments	(11)		(24)		—		(17)		(52)
Balance at March 29, 2025	$	7	$	—	$	—	$	—	$	7

(a) Restructuring activities

(b) Includes $19 million of Transaction related compensation

Income Taxes	6 Months Ended
Income Taxes	Mar. 29, 2025
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The YTD effective income tax rate was unfavorably impacted by the jurisdictional mix of pre-tax results among the Company and its subsidiaries and losses, which generate no tax benefit in domestic and certain foreign jurisdictions.

- Definition

The entire disclosure for income tax.

+ References

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+ Details

Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Mar. 29, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	On November 4, 2024 (the “Closing Date”), Treasure Holdco, Inc. (“Treasure”), which was a wholly owned subsidiary of Berry Global Group, Inc. (“Berry”), completed its merger (the “Transaction”) with the Glatfelter Corporation (“GLT”) which concurrently changed its name to Magnera Corporation (the “Company,” “we,” or “Magnera”). As a result, pre-Transaction Treasure shareholders received shares of Magnera representing 90% of the combined company and GLT shareholders retained 10%. As Treasure was identified as the accounting acquirer, the prior year presentation represents standalone Treasure results with the acquisition method of accounting being applied to the assets acquired and liabilities assumed of GLT. See Note 3—Acquisition. The accompanying unaudited Consolidated and Combined Financial Statements of Magnera Corporation have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim reporting.
Use of Estimates	In preparing financial statements in conformity with GAAP, we must make estimates and assumptions that affect the reported amounts and disclosures at the date of the financial statements and during the reporting period. Actual results could differ from those estimates.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In 2023, the Financial Accounting Standards Board ("FASB") issued guidance with the goal of providing more information about reportable segments, including disaggregated expense information. The Company adopted all required disclosures requirements in fiscal 2025. In 2023, the FASB issued guidance with the goal of providing more information in the income tax reconciliation table and regarding income taxes paid. The Company is currently evaluating the impact of adopting this guidance. In 2024, the FASB issued guidance with the goal of providing more expense information of certain categories of expenses that are included in line items on the face of the statements of earnings. The Company is currently evaluating the impact of adopting this guidance.
Revenue and Accounts Receivable	Revenue is recognized when performance obligations are satisfied, in an amount reflecting the consideration to which the Company expects to be entitled. We consider the promise to transfer products to be our sole performance obligation. Generally, our revenue is recognized for standard promised goods at the time of shipment, when title and risk of loss pass to the customer. The Company disaggregates revenue based on geography.