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Document and Entity Information - USD ($)
12 Months Ended
Jan. 31, 2022
Mar. 23, 2022
Jul. 31, 2021
Document And Entity Information Abstract      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 31, 2022    
Document Transition Report false    
Entity File Number 0-18183    
Entity Registrant Name G III APPAREL GROUP LTD /DE/    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 41-1590959    
Entity Address, Address Line One 512 Seventh Avenue    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10018    
City Area Code 212    
Local Phone Number 403-0500    
Title of 12(b) Security Common Stock    
Trading Symbol GIII    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location New York, New York    
Entity Shell Company false    
Entity Public Float     $ 1,374,424,507
Entity Common Stock Shares Outstanding   47,915,388  
Entity Central Index Key 0000821002    
Current Fiscal Year End Date --01-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false