XML 19 R55.htm IDEA: XBRL DOCUMENT
v2.4.0.8

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