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Commitments and Contingencies (Details) (USD $)
Nov. 30, 2014
sqft
Aug. 30, 2014
acre
Commitments and Contingencies    
Purchase obligations for construction of Griffin Land, square feet 280,000us-gaap_AreaOfRealEstateProperty  
Undeveloped land    
Commitments and Contingencies    
Number of acres   45us-gaap_AreaOfLand
/ us-gaap_MajorPropertyClassAxis
= grif_UndevelopedMember
Undeveloped land | Agreement to sell    
Commitments and Contingencies    
Number of acres to be sold   29grif_NumberOfAcresToBeSold
/ us-gaap_MajorPropertyClassAxis
= grif_UndevelopedMember
/ us-gaap_TypeOfArrangementAxis
= grif_SaleAgreementMember
Undeveloped land | Agreement to sell | Minimum    
Commitments and Contingencies    
Sale price of land   3,250grif_SalePriceOfLand
/ us-gaap_MajorPropertyClassAxis
= grif_UndevelopedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TypeOfArrangementAxis
= grif_SaleAgreementMember
Property and inventory purchase commitments    
Commitments and Contingencies    
Purchase obligations 6,492,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= grif_CapitalAdditionAndInventoryPurchaseCommitmentsMember