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Cover
Dec. 16, 2024
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 16, 2024
Entity File Number 001-03560
Entity Registrant Name Magnera Corporation
Entity Central Index Key 0000041719
Entity Tax Identification Number 23-0628360
Entity Incorporation, State or Country Code PA
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value per share
Trading Symbol MAGN
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Information, Former Legal or Registered Name Glatfelter Corporation
Former Address [Member]  
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