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Document and Entity Information (USD $)
 12 Months Ended
Jan. 31, 2015
Mar. 30, 2015
Jul. 31, 2014
Document And Entity Information Abstract      
Entity Registrant Name G III APPAREL GROUP LTD /DE/    
Entity Central Index Key 0000821002    
Trading Symbol giii    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --01-31    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Common Stock Shares Outstanding   22,486,597dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 1,532,250,692dei_EntityPublicFloat
Document Type 10-K    
Document Period End Date Jan. 31, 2015    
Amendment Flag false    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY