Entity Addresses, Address Type [Axis] Consolidated and Combined Statements of Operations [Abstract] Operating income (loss) Operating income (loss) Income (loss) before income taxes Net income (loss) Net income (loss) Consolidated net income (loss) Consolidated and Combined Statements of Comprehensive Income (Loss) [Abstract] Other comprehensive income (loss) Other comprehensive income (loss) Comprehensive income (loss) Consolidated and Combined Balance Sheets [Abstract] Total current assets Total assets Total current liabilities Total liabilities Total stockholders’ equity Beginning balance Ending balance Total liabilities and stockholders’ equity Net cash from operating activities Net cash from (used in) investing activities Net cash from (used in) financing activities Net change in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at the end of period Equity Components [Axis] Basis of Presentation [Abstract] Revenue and Accounts Receivable [Abstract] Acquisition [Abstract] Geographical [Axis] Total consideration Business Combination [Axis] Legal Entity [Axis] Transaction and Other Activities [Abstract] Segments [Axis] Balance at September 28, 2024 Balance at March 29, 2025 Restructuring Type [Axis] Leases [Abstract] Long-Term Debt [Abstract] Debt Instrument [Axis] Long-Term Debt, Type [Axis] Total long-term debt Financial Instruments and Fair Value Measurements [Abstract] Derivative Instrument [Axis] Hedging Designation [Axis] Total Impairment charges Impairment charge Fair Value Hierarchy and NAV [Axis] Measurement Frequency [Axis] Income Taxes [Abstract] Segment and Geographic Data [Abstract] Product and Service [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Contingencies and Commitments [Abstract] Basic and Diluted Net Income (Loss) Per Share [Abstract] Corporate Expense Allocation [Abstract] Document Type Document Quarterly Report Document Period End Date Document Fiscal Year Focus Document Transition Report Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Entity File Number Entity Registrant Name Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Information, Former Legal or Registered Name Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Amendment Flag Document Fiscal Period Focus Current Fiscal Year End Date Net sales Costs and expenses: Cost of goods sold Selling, general and administrative Amortization of intangibles Transaction and other activities Corporate expense allocation Interest expense Income tax benefit Net income (loss) per share: Basic (in Dollars per share) Diluted (in Dollars per share) Other comprehensive income, net of tax: Currency translation gain (loss) Assets Current assets: Cash and cash equivalents Accounts receivable Finished goods Raw materials Prepaid expenses and other current assets Noncurrent assets: Property, plant and equipment Goodwill and intangible assets Right-of-use assets Operating lease right-of-use assets Other assets Liabilities and stockholders’ equity Current liabilities: Accounts payable Accrued expenses Current portion of long-term debt Current portion of long-term debt Noncurrent liabilities: Long-term debt Long-term debt, less current portion Deferred income taxes Operating lease liabilities Noncurrent operating lease liabilities Other long-term liabilities Stockholders’ equity: Berry net investment Additional paid-in capital Retained loss Accumulated other comprehensive loss Cash Flows from Operating Activities: Adjustments to reconcile net cash from operating activities: Depreciation Deferred income tax Share-based compensation expense Cash Flows from Investing Activities: Cash acquired from GLT acquisition Settlement of net investment hedges Cash Flows from Financing Activities: Proceeds from long-term borrowings Transfers from (to) Berry, net Effect of currency translation on cash Share-based compensation October net investment Acquisition of GLT Other expense (income), net Non-cash interest expense Other non-cash operating activities, net Changes in working capital, net Change in other assets and liabilities Additions to property, plant and equipment, net Other investing activities and other Repayments on long-term borrowings Cash distribution to Berry Debt fees and other, net Other Transfers from parent, net Transfers to Berry, net Distribution of Berry’s net investment Former Address [Member] Berry Net Investment [Member] Additional Paid-in Capital [Member] Other Comprehensive Income (Loss) - Currency Translation [Member] Retained Loss [Member] Basis of Presentation Revenue and Accounts Receivable Acquisition Recognized Identified Assets Acquired and Liabilities Assumed Fair value of GLT common stock concurrent with closing Identifiable assets acquired and liabilities assumed Cash Working capital Property, plant and equipment Identifiable intangible assets Other assets Goodwill Transaction and Other Activities Restructuring and Related Costs by Reportable Segment Transaction and other activities Charges Restructuring Accrual Non-cash items Leases Lease Assets and Liabilities Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Current operating lease liabilities Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance lease right-of-use assets Long-Term Debt Long-term Debt Maturity date Long-term debt Interest rate Interest rate on debt Financial Instruments and Fair Value Measurements Fair Value of Derivatives and Location on Consolidated and Combined Balance Sheets Effect of Derivatives on Consolidated and Combined Statements of Operations Assets Measured at Fair Value on Non-recurring Basis Indefinite-lived trademarks Goodwill Definite lived intangible assets Property, plant, and equipment Income Taxes Segment and Geographic Data Selected Information by Reportable Segment Net Sales Operating income (loss) Depreciation and amortization Depreciation and amortization Selected Information by Geographical Region Net Sales Selected Information by Category Net Sales Concentration risk percentage Contingencies and Commitments Basic and Diluted Net Income (Loss) Per Share Basic and Diluted Earnings per Share Numerator Denominator Weighted average common shares outstanding - basic (in Shares) Weighted average common shares outstanding - dilutive (in Shares) Corporate Expense Allocation Other long-term liabilities Debt Cash payments Debt discounts, deferred fees and other Fair value of derivative instruments Interest expense Impairment charges Impairment charges Impairment charges Americas [Member] GLT Acquisition [Member] Berry Global Group, Inc. [Member] Americas [Member] Rest of World [Member] Employee Severance and Benefits [Member] Transaction Activities [Member] Non-Cash Charges [Member] Other Activities [Member] Revolving Credit Facility [Member] Line of Credit [Member] Term Loan [Member] 7.25% First Priority Senior Secured Notes [Member] Senior Notes [Member] 4.75% First Priority Senior Secured Notes [Member] Cross-currency swaps [Member] Designated as Hedging [Member] Cross-currency Swaps [Member] Level 1 [Member] Fair Value, Nonrecurring [Member] Level 2 [Member] Level 3 [Member] United States and Canada [Member] Latin America [Member] Personal Care [Member] Consumer Solutions [Member] Revenue Benchmark [Member] Product Concentration Risk [Member] Ownership [Axis] Statement of Financial Position Location, Balance [Axis] Accounting Policies [Abstract] Ownership interest Inventory step up Pro forma net sales Pro forma net loss Transaction related compensation Long-term debt (in Dollars) Notional amount (in Euro) Fair value of long-term indebtedness greater/(less) than book value Number of reportable segments Number of operating segments Term to reimburse government oversight costs Accrual for environmental loss contingencies Escrow asset Deferred consideration accretion rate Deferred consideration Percentage of shares allocated as of the completion of the Transaction Antidilutive shares excluded from calculation of earnings per share (in Shares) Business Combination Basis of Presentation Use of Estimates Recently Issued Accounting Pronouncements Revenue and Accounts Receivable Magnera Corporation [Member] Treasure Shareholders [Member] Glatfelter Shareholders [Member] Treasure Holdco, Inc. [Member] Cross-Currency Swap Maturing November 2027 [Member] Cross-Currency Swap Maturing November 2029 [Member] Previous Acquisition [Member] Other Long-term Liabilities [Member] Equity Component [Domain] Statement [Table] Statement [Line Items] Geographical [Domain] Business Combination [Domain] Entity [Domain] Asset Acquisition [Table] Acquisition [Abstract] Segments [Domain] Schedule Of Restructuring And Related Costs [Table] Transaction and Other Activities [Abstract] Type of Restructuring [Domain] Long-Term Debt, Type [Domain] Debt Instrument, Name [Domain] Debt Instrument [Table] Long-Term Debt [Abstract] Hedging Designation [Domain] Derivative Contract [Domain] Fair Value By Balance Sheet Grouping [Table] Financial Instruments and Fair Value Measurements [Abstract] Measurement Frequency [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Recurring and Nonrecurring [Table] Financial Instruments and Fair Value Measurements [Abstract] Schedule Of Segment Reporting Information By Segment [Table] Segment and Geographic Data [Abstract] Product and Service [Domain] Concentration Risk Type [Domain] Concentration Risk Benchmark [Domain] Ownership [Domain] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Basis of Presentation [Abstract] Statement of Financial Position Location, Balance [Domain] Loss Contingencies [Table] Contingencies and Commitments [Abstract] Basic and Diluted Net Income (Loss) Per Share (Details) [Table] Basic and Diluted Net Income (Loss) Per Share [Abstract] Corporate Expense Allocation (Details) [Table] Corporate Expense Allocation [Abstract] Adjustments To Additional Paid In Capital, Acquisition Schedule of Information related to leases. Accretion rate for liability related to certain tax claims treated as a deferred purchase price (Deferred Consideration). Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital Corporate Expense Allocation Corporate Expense Allocation Distribution of Parent's Net Investment Escrow asset related to environmental claims regarding the Fox River located in Neenah, Wisconsin. Increase (Decrease) In Working Capital Non-Cash Interest Income (Expense), Net Payments For Transfers To Parent The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and other costs. Percentage of shares allocated as of the completion of the Transaction for comparability purposes in the earnings per share calculations Proceeds (Payments) From (To) Parent, Net Restructuring, Non-Cash Items Period of time the Company is primarily responsible for the reimbursement of government oversight costs associated with certain environmental claims regarding the Fox River located in Neenah, Wisconsin. Transaction Bonuses Transfers From Parent Transfers from Parent, Net Transfers To Parent, Net 4.75% First Priority Senior Secured Notes 7.25% First Priority Senior Secured Notes Americas Segment Berry Global Group, Inc. Consumer Solutions Cross-Currency Swap Maturing November 2027 Cross-Currency Swap Maturing November 2029 GLT Acquisition Glatfelter Shareholders The non-cash charges related to the impairment of assets. Personal Care Previous Acquisition Rest of the world, excluding the Americas (United States, Canada and Latin America). Revolving Credit Facility Due November 2029 Term Loan Due November 2031 Transaction Activities Treasure Holdco, Inc. United States and Canada. Right-of-use asset Accrued expenses Property, plant, and equipment, net Operating lease liability Address Type [Domain] Derivative, Notional Amount City Area Code Number of Operating Segments Entity Small Business Entity Address, City or Town Earnings Per Share, Diluted Senior Notes [Member] Liabilities, Noncurrent [Abstract] Use of Estimates, Policy [Policy Text Block] Retained Earnings [Member] Previous Acquisition Member Glatfelter Shareholders Member Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Assets [Abstract] Weighted Average Number of Shares Outstanding, Basic Treasure Shareholders Member Business Combination [Text Block] Proceeds Payments From To Parent Net Other Nonoperating Income (Expense) Cost of Product and Service Sold Increase Decrease In Working Capital Long-Term Debt, Current Maturities Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Statement of Stockholders' Equity [Abstract] United States And Canada Member Basis of Accounting, Policy [Policy Text Block] Business Combination, Pro Forma Information, Pro Forma Revenue Local Phone Number Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Business Combination Contingent Consideration Liability Accretion Rate Income Tax Expense (Benefit) Amortization of Intangible Assets Lessee, Operating Leases [Text Block] Product Concentration Risk [Member] New Accounting Pronouncements, Policy [Policy Text Block] Segment Reporting Information [Line Items] Entity Information, Former Legal or Registered Name Treasure Holdco Inc. Member Other Assets, Noncurrent Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Working Capital Title of 12(b) Security Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Schedule of Segment Reporting Information, by Segment [Table Text Block] Additional Paid in Capital Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory Earnings Per Share, Basic Other Noncash Income (Expense) Net Sales Abstract0 Security Exchange Name Net Sales Abstract1 Assets Liabilities APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Restructuring and Related Costs [Table Text Block] A7.25 First Priority Senior Secured Notes Member Equity, Attributable to Parent [Abstract] Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Berry Global Group Inc. Member Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Earnings Per Share, Basic [Abstract] Entity Address, State or Province Entity Shell Company Entity Common Stock, Shares Outstanding Cross Currency Interest Rate Contract [Member] Employee Severance [Member] Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Americas Segment Member Assets, Fair Value Disclosure Consumer Solutions Member Goodwill, Fair Value Disclosure Transaction Activities Member Asset Impairment Charges Depreciation Debt Instrument [Line Items] Currency Swap [Member] Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Transfers From Parent Net Inventory, Finished Goods, Net of Reserves Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Proceeds from Issuance of Long-Term Debt Assets And Liabilities Lessee Table Text Block Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Payments to Acquire Property, Plant, and Equipment Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] Cross Currency Swap Maturing November2029 Member Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Accounts Payable, Current Asset Acquisition [Line Items] Adjustments To Additional Paid In Capital Acquisition Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Fair Value, Inputs, Level 2 [Member] Costs and Expenses [Abstract] Gain (Loss) on Fair Value Hedges Recognized in Earnings Restructuring Reserve Depreciation, Depletion and Amortization [Abstract] Entity Address, Address Line Two Entity Address, Address Line One Entity Incorporation, State or Country Code Goodwill, Impairment Loss Revenue from Contract with Customer, Including Assessed Tax Member Units [Member] Interest Expense, Nonoperating Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Net Income (Loss) Attributable to Parent [Abstract] Corporate Expense Allocation Text Block Amendment Flag Noncash Impairment Charges Member Restructuring Non Cash Items Loss Contingencies [Line Items] Financial Instruments Disclosure [Text Block] Operating Income (Loss) Additional Paid-in Capital [Member] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Long-Term Debt, Gross Business Combination, Contingent Consideration, Liability, Noncurrent Non Cash Interest Income Expense Net Restructuring and Related Activities Disclosure [Text Block] Entity Central Index Key Corporate Expense Allocation Repayments of Long-Term Debt Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Term For Reimbursement Of Government Oversight Costs Property, Plant, and Equipment, Fair Value Disclosure Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Former Address [Member] Accrual for Environmental Loss Contingencies Retained Earnings (Accumulated Deficit) Other Restructuring [Member] A4.75 First Priority Senior Secured Notes Member Magnera Corporation Member Goodwill Entity Registrant Name Debt Instrument, Interest Rate, Stated Percentage Designated as Hedging Instrument [Member] Cash Acquired from Acquisition AOCI Attributable to Parent [Member] Statement of Cash Flows [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Revolving Credit Facility Due November2029 Member Personal Care Member GLTAcquisition Member Business Combination [Policy Text Block] Income Tax Disclosure [Text Block] Operating Income (Loss) [Abstract] Payments for Restructuring Fair Value, Inputs, Level 3 [Member] Operating Lease, Liability, Current Other Liabilities, Noncurrent Selling, General and Administrative Expense Fair Value, Nonrecurring [Member] Liabilities, Current [Abstract] Long-Term Debt, Excluding Current Maturities Finite-Lived Intangible Assets, Fair Value Disclosure Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Deferred Income Tax Liabilities, Net Proceeds from Hedge, Investing Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Finance Lease, Right-of-Use Asset, after Accumulated Amortization Basicand Diluted Net Income Loss Per Share Details Line Items Transfers To Parent Net Intangible Assets, Net (Including Goodwill) Rest Of World Member Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Revenue from Contract with Customer [Text Block] Escrow Asset For Environmental Claims Fair Value, Inputs, Level 1 [Member] Corporate Expense Allocation Details Line Items Equity, Attributable to Parent Payments Of Debt Issuance Costsand Other Net Accumulated Other Comprehensive Income (Loss), Net of Tax Line of Credit [Member] Fair Value Measurements, Nonrecurring [Table Text Block] Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Earnings Per Share [Text Block] Restructuring Cost and Reserve [Line Items] Cross Currency Swap Maturing November2027 Member Concentration Risk, Percentage Comprehensive Income (Loss), Net of Tax, Attributable to Parent Current Fiscal Year End Date Depreciation, Depletion and Amortization Revenue [Policy Text Block] Long-Term Debt Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Impairment of Intangible Assets, Finite-Lived Segment Reporting Disclosure [Text Block] Document Fiscal Year Focus Entity Address, Postal Zip Code Entity Current Reporting Status Entity Emerging Growth Company Revenue Benchmark [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Term Loan Due November2031 Member Weighted Average Number of Shares Outstanding, Diluted Deferred Income Tax Expense (Benefit) Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value, Option, Aggregate Differences, Long-Term Debt Instruments Inventory, Raw Materials, Net of Reserves Accounts Receivable, after Allowance for Credit Loss, Current Document Transition Report Cash and Cash Equivalent Net Income (Loss) Attributable to Parent Debt Instrument, Face Amount Assets, Current [Abstract] Document Quarterly Report Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net Sales Abstract Document Fiscal Period Focus Payments For Transfers To Parent Schedule of Debt [Table Text Block] Latin America [Member] Transfers From Parent Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Liabilities, Current Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Long-Term Debt [Text Block] Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Percentage Of Shares Allocated Document Type Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Members' Capital Entity Tax Identification Number Entity File Number Business Combination, Consideration Transferred, Equity Interest Commitments and Contingencies Disclosure [Text Block] Document Period End Date Payment for (Proceeds from) Other Investing Activity Distribution Of Parents Net Investment Restructuring Costs Entity Interactive Data Current Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Liabilities and Equity [Abstract] Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block] Entity Filer Category Impairment, Long-Lived Asset, Held-for-Use Restructuring Charges Debt Instrument, Maturity Date Liabilities and Equity Other Noncurrent Liabilities [Member] Other Comprehensive Income (Loss), Net of Tax [Abstract] Share-Based Payment Arrangement, Noncash Expense Stockholders' Equity, Other Transaction Bonuses Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Number of Reportable Segments Assets, Noncurrent [Abstract] Trading Symbol Revenue from External Customers by Products and Services [Table Text Block] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Derivative Liability, Subject to Master Netting Arrangement, before Offset Americas [Member] Assets, Current Increase (Decrease) in Other Operating Assets and Liabilities, Net