Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2015	Sep. 01, 2015
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	Large Accelerated Filer
Entity Common Stock Shares Outstanding		45,220,024
Document Type	10-Q
Document Period End Date	Jul. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2