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Canadian Customs Duty Examination (Detail Textuals) - CBSA $ in Millions, $ in Millions			3 Months Ended
	Mar. 14, 2018 USD ($)	Mar. 14, 2018 CAD ($)	Apr. 30, 2018 USD ($)
Canadian Customs Duty Examination [Line Items]
Value of bond issued for prepayments of additional duties	$ 20.9	$ 26.9
Amendment in prepayments of additional duties	$ 1.1	$ 1.4
Deferred higher dutiable value			$ 1.9

X

- Definition

Represents amendment in prepayments of additional duties paid.

+ References

No definition available.

+ Details

Name:	giii_AmendmentInPrepaymentsOfAdditionalDuties
Namespace Prefix:	giii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Represents amount of deferred higher dutiable value.

+ References

No definition available.

+ Details

Name:	giii_DeferredHigherDutiableValue
Namespace Prefix:	giii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents Bond issue value for prepayments of additional duties as a result of reassessment.

+ References

No definition available.

+ Details

Name:	giii_ValueOfBondIssuedForPrepaymentsOfAdditionalDuties
Namespace Prefix:	giii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=giii_CanadianBorderServiceAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: