v3.25.1

Basis of Presentation (Details)		1 Months Ended	5 Months Ended
Basis of Presentation (Details)	Nov. 04, 2024 shares	Nov. 04, 2024 Segment shares	Mar. 29, 2025 Segment
Basis of Presentation [Abstract]
Number of shares of Magnera's common stock each Berry stockholder received (in shares)	0.276305	0.276305
Number of Berry shares held to receive .276305 shares of Magnera's common stock (in shares)	1	1
Reverse stock split ratio	0.076923
Number of reportable segments \| Segment		4	3

Number of shares of common stock held by each Berry stockholder in order to receive 0.276305 shares of Magnera's common stock upon completion of the spin-off and merger of the Company's former Health, Hygiene & Specialties Global Nonwovens and Films business with Glatfelter Corporation.

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- Definition

Number of shares of Magnera's common stock distributed to each Berry stockholder upon completion of the spin-off and merger of the Company's former Health, Hygiene & Specialties Global Nonwovens and Films business with Glatfelter Corporation.

+ References

No definition available.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (a)
-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SAB Topic 4.C)
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BERRY GLOBAL GROUP, INC. 10-Q