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SEGMENTS - Method of Overhead Allocation (Detail 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 514,323us-gaap_SalesRevenueGoodsNet	$ 812,330us-gaap_SalesRevenueGoodsNet	$ 424,010us-gaap_SalesRevenueGoodsNet	$ 366,192us-gaap_SalesRevenueGoodsNet	$ 472,756us-gaap_SalesRevenueGoodsNet	$ 668,702us-gaap_SalesRevenueGoodsNet	$ 304,158us-gaap_SalesRevenueGoodsNet	$ 272,615us-gaap_SalesRevenueGoodsNet	$ 2,116,855us-gaap_SalesRevenueGoodsNet	$ 1,718,231us-gaap_SalesRevenueGoodsNet	$ 1,399,719us-gaap_SalesRevenueGoodsNet
Long-Lived Assets	247,852us-gaap_NoncurrentAssets				244,707us-gaap_NoncurrentAssets				247,852us-gaap_NoncurrentAssets	244,707us-gaap_NoncurrentAssets	201,188us-gaap_NoncurrentAssets
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,796,358us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember	1,528,473us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember	1,333,885us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember
Long-Lived Assets	132,822us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember				106,638us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember				132,822us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember	106,638us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember	81,606us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_UnitedStatesMember
Non-United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									320,497us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember	189,758us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember	65,834us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember
Long-Lived Assets	$ 115,030us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember				$ 138,069us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember				$ 115,030us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember	$ 138,069us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember	$ 119,582us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = giii_OtherGeographicRegionMember

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

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X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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