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SEGMENTS - Information of Total Assets for Company's Reportable Segments (Detail 1) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2015 | Jan. 31, 2014 | Jul. 31, 2014
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Segment Reporting Information [Line Items] |  |  |
Total assets | $ 1,046,718 us-gaap_Assets | $ 830,897 us-gaap_Assets |
Licensed |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 441,516 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_LicensedMember |  | 361,634 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_LicensedMember
Non-licensed |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 242,963 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_NonLicensedMember |  | 225,163 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_NonLicensedMember
Retail |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 182,363 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_RetailMember |  | 129,895 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = giii_RetailMember
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 179,876 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | $ 114,205 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=giii_NonLicensedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=giii_RetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |