v3.26.1
Cover
Mar. 16, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 16, 2026
Entity File Number 001-39687
Entity Registrant Name GPGI, Inc.
Entity Central Index Key 0001823144
Entity Tax Identification Number 85-2749902
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 309 Pierce Street
Entity Address, City or Town Somerset
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 08873
City Area Code 908
Local Phone Number 518-0500
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Class A Common stock, par value $0.0001 per share
Trading Symbol GPGI
Security Exchange Name NYSE
Entity Emerging Growth Company false