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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Dec. 01, 2012
Jan. 08, 2014
Property and Equipment        
Property and Equipment, gross $ 1,218us-gaap_PropertyPlantAndEquipmentGross $ 15,998us-gaap_PropertyPlantAndEquipmentGross    
Accumulated depreciation (988)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (14,048)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment    
Property and Equipment, net 230us-gaap_PropertyPlantAndEquipmentNet 1,950us-gaap_PropertyPlantAndEquipmentNet    
Depreciation expense 111us-gaap_Depreciation 335us-gaap_Depreciation 362us-gaap_Depreciation  
Land        
Property and Equipment        
Property and Equipment, gross   437us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
   
Land improvements        
Property and Equipment        
Property and Equipment, gross   1,561us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandImprovementsMember
   
Land improvements | Minimum        
Property and Equipment        
Estimated Useful Lives 10 years      
Land improvements | Maximum        
Property and Equipment        
Estimated Useful Lives 20 years      
Buildings and improvements        
Property and Equipment        
Property and Equipment, gross   1,865us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
   
Buildings and improvements | Minimum        
Property and Equipment        
Estimated Useful Lives 10 years      
Buildings and improvements | Maximum        
Property and Equipment        
Estimated Useful Lives 40 years      
Machinery and equipment        
Property and Equipment        
Property and Equipment, gross 1,218us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
12,135us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
   
Machinery and equipment | Minimum        
Property and Equipment        
Estimated Useful Lives 3 years      
Machinery and equipment | Maximum        
Property and Equipment        
Estimated Useful Lives 20 years      
Imperial's landscape nursery business | Connecticut production nursery        
Property and Equipment        
Property and Equipment, gross       11,485us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grif_ProductionNurseryMember
/ us-gaap_StatementBusinessSegmentsAxis
= grif_LandscapeNurseryMember
Accumulated depreciation       (9,850)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grif_ProductionNurseryMember
/ us-gaap_StatementBusinessSegmentsAxis
= grif_LandscapeNurseryMember
Property and Equipment, net       $ 1,635us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grif_ProductionNurseryMember
/ us-gaap_StatementBusinessSegmentsAxis
= grif_LandscapeNurseryMember