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SUBSEQUENT EVENTS (Detail Textual) - Subsequent Event $ in Millions, $ in Millions	Mar. 14, 2018 USD ($)	Mar. 14, 2018 CAD ($)	Feb. 05, 2018 USD ($)
CBSA
Subsequent Event [Line Items]
Amendment in prepayments of additional duties	$ 1.1	$ 1.4
LVMH
Subsequent Event [Line Items]
Payments for accrued adjusted goodwill			$ 4.6
Value of bond issued for prepayments of additional duties	$ 20.9	$ 26.9

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

Represents payments made for accrued adjusted goodwill made in connection with acquisition of DKI.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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Namespace Prefix:
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