Document and Entity Information (USD $)	9 Months Ended
	Oct. 31, 2011	Dec. 01, 2011	Jul. 31, 2010
Document and Entity Information [Abstract]
Entity Registrant Name	G III APPAREL GROUP LTD /DE/
Entity Central Index Key	0000821002
Document Type	10-Q
Document Period End Date	Oct. 31, 2011
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--01-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 402,467,461
Entity Common Stock, Shares Outstanding		19,767,697