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SEGMENTS - Information of Total Assets for Company's Reportable Segments (Detail 1) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jul. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 1,046,718us-gaap_Assets	$ 830,897us-gaap_Assets
Licensed
Segment Reporting Information [Line Items]
Total assets	441,516us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_LicensedMember		361,634us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_LicensedMember
Non-licensed
Segment Reporting Information [Line Items]
Total assets	242,963us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_NonLicensedMember		225,163us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_NonLicensedMember
Retail
Segment Reporting Information [Line Items]
Total assets	182,363us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_RetailMember		129,895us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_RetailMember
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 179,876us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember		$ 114,205us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

Name:	us-gaap_Assets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=giii_LicensedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=giii_NonLicensedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=giii_RetailMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: