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Inventories - Textuals (Details) - USD ($) $ in Millions	Apr. 30, 2021	Jan. 31, 2021	Apr. 30, 2020
Inventory [Line Items]
Inventory held on consignment	$ 4.6	$ 3.5	$ 6.6
Prepaid Expenses and Other Current Assets
Inventory [Line Items]
Inventory return asset	$ 16.9	$ 22.5	$ 21.3

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

- Definition

Represents the inventory return asset, which consists of the amount of goods that are anticipated to be returned by customers.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: