v3.25.2
Cover Page
Aug. 05, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Aug. 05, 2025
Entity Registrant Name Magnera Corporation
Entity Incorporation, State or Country Code PA
Entity File Number 001-03560
Entity Tax Identification Number 23-0628360
Entity Address, Address Line One 9335 Harris Corners Pkwy
Entity Address, Address Line Two Ste 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol MAGN
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0000041719
Amendment Flag false