Line of credit facility repayment of borrowing capacity under financial agreement.

No definition available.

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

- Details

Name:	giii_NotesPayableAdditionalTextualAbstract
Namespace Prefix:	giii_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	giii_NotesPayableTextualAbstract
Namespace Prefix:	giii_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-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 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Notes Payable (Details) (USD $) In Millions, unless otherwise specified	Aug. 06, 2012	Jul. 31, 2012	Jul. 31, 2011
Notes Payable (Additional Textual) [Abstract]
Senior secured revolving credit facility aggregate principal amount	$ 450	$ 300
Amounts payable under revolving credit facility		87.0	142.0
Line of credit facility repayment of borrowing capacity under financial agreement	$ 97.1
Prime rate plus [Member]
Notes Payable (Textual) [Abstract]
Spread interest rate		0.50%
Prime rate plus [Member] \| Maximum [Member]
Notes Payable (Textual) [Abstract]
Spread interest rate	1.00%
Prime rate plus [Member] \| Minimum [Member]
Notes Payable (Textual) [Abstract]
Spread interest rate	0.50%
LIBOR plus [Member]
Notes Payable (Textual) [Abstract]
Spread interest rate		2.75%
LIBOR plus [Member] \| Maximum [Member]
Notes Payable (Textual) [Abstract]
Spread interest rate	2.00%
LIBOR plus [Member] \| Minimum [Member]
Notes Payable (Textual) [Abstract]
Spread interest rate	1.50%