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Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Employer matching percentage of employee contributions	50.00%
Defined contribution plan, matching contributions	$ 1.3	$ 1.0	$ 0.9
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employee contribution percentage for which employer contributes a matching contribution	6.00%

X

- Definition

Percentage Of Employer Contribution To Match Participant Contribution In Defined Contribution Plan

+ References

No definition available.

+ Details

Name:	giii_PercentageOfEmployerContributionToMatchParticipantContributionInDefinedContributionPlan
Namespace Prefix:	giii_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration