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EMPLOYEE BENEFIT PLANS (Details Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Non-discretionary matching contribution |  |  | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Percentage of employee's compensation matched by employer |  |  | 3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Employer matching percentage of employee contributions |  |  | 50.00%giii_PercentageOfEmployerContributionToMatchParticipantContributionInDefinedContributionPlan
Percentage of additional employee's compensation matched by employer |  |  | 2.00%giii_DefinedContributionPlanAdditionalMaximumAnnualContributionsPerEmployeePercent
Defined contribution plan, matching contributions | $ 2.0 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1.3 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1.0 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employee contribution percentage for which employer contributes a matching contribution |  |  | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MaximumMember

X
- Definition Represents defined contribution plan additional maximum annual contributions per employee percent. + References No definition available. + Details
Name: | giii_DefinedContributionPlanAdditionalMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | giii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |