Document and Entity Information	9 Months Ended
	Oct. 31, 2013	Dec. 01, 2013
Document And Entity Information [Abstract]
Entity Registrant Name	G III APPAREL GROUP LTD /DE/
Entity Central Index Key	0000821002
Trading Symbol	giii
Current Fiscal Year End Date	--01-31
Entity Filer Category	Accelerated Filer
Entity Common Stock Shares Outstanding		20,399,821
Document Type	10-Q
Document Period End Date	Oct. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3