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INVENTORIES (Detail Textuals) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
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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