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INVENTORIES (Detail Textuals) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Inventory Disclosure [Abstract]
Inventory held on consignment	$ 3.3	$ 2.8

X

- Definition

Represents inventory held on consignment on reporting date.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration