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PROPERTY AND EQUIPMENT - Property and Equipment at Cost (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 120,140us-gaap_PropertyPlantAndEquipmentGross $ 101,206us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation 38,469us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 38,374us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 81,671us-gaap_PropertyPlantAndEquipmentNet 62,832us-gaap_PropertyPlantAndEquipmentNet
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of fixed assets 5 years  
Property and equipment, gross 1,195us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
2,077us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 67,066us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
60,817us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of fixed assets 3 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of fixed assets 13 years  
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 43,440us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
30,883us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Furniture and fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of fixed assets 3 years  
Furniture and fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of fixed assets 5 years  
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,439us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= giii_ComputersEquipmentAndSoftwareMember
$ 7,429us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= giii_ComputersEquipmentAndSoftwareMember
Computer equipment and software | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of fixed assets 2 years  
Computer equipment and software | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of fixed assets 3 years