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Segments (Details Textual) (USD $)	9 Months Ended
	Oct. 31, 2012 Segment	Oct. 31, 2011	Jan. 31, 2012
Segments (Textual) [Abstract]
Number of operating segments	4
Finished goods	$ 299,797,000	$ 265,224,000	$ 244,884,000
Expenses and Integration Costs	1,800,000	3,700,000
Wholesale licensed [Member]
Segments (Textual) [Abstract]
Finished goods	198,300,000	175,600,000
Wholesale non-licensed [Member]
Segments (Textual) [Abstract]
Finished goods	38,900,000	37,300,000
Retail [Member]
Segments (Textual) [Abstract]
Finished goods	55,000,000	52,300,000
Other [Member]
Segments (Textual) [Abstract]
Finished goods	$ 7,600,000

X

- Definition

Expenses and integration costs associated with acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	giii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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X

- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section BB



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.BB)

-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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