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Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2018	Sep. 04, 2018
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		49,179,023
Document Type	10-Q
Document Period End Date	Jul. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2

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