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Document and Entity Information - USD ($)
 12 Months Ended
Jan. 31, 2025
Mar. 19, 2025
Jul. 31, 2024
Document And Entity Information Abstract      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 31, 2025    
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    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 1,461,813,535
Entity Common Stock Shares Outstanding   43,883,207  
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location New York, New York    
Entity Central Index Key 0000821002    
Current Fiscal Year End Date --01-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Documents Incorporated by Reference

Documents incorporated by reference: Certain portions of the registrant’s definitive Proxy Statement relating to the registrant’s Annual Meeting of Stockholders to be held on or about June 12, 2025, to be filed pursuant to Regulation 14A of the Securities Exchange Act of 1934 with the Securities and Exchange Commission, are incorporated by reference into Part III of this Report.