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Information Regarding Reportable Segments (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 31, 2013
Segment Reporting Information [Line Items] |
Expenses and Integration Costs | $ 4.0

X
- Definition Expenses and integration costs associated with acquisition. + References No definition available. + Details
Name: | giii_ExpensesAndIntegrationCostsAssociatedWithAcquisition
Namespace Prefix: | giii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration