INVENTORIES (Detail textuals) $ in Millions	Jan. 31, 2017 USD ($)
Inventory Disclosure [Abstract]
Inventory held on consignment	$ 2.8

Represents inventory held on consignment on reporting date.

No definition available.

Name:	giii_InventoryHeldOnConsignment
Namespace Prefix:	giii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant