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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
sqft
Jun. 27, 2014
sqft
Commitments and Contingencies    
Purchase obligations for construction of Griffin Land, square feet 280,000us-gaap_AreaOfRealEstateProperty  
Undeveloped land    
Commitments and Contingencies    
Area of Land   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 15,781us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= grif_CapitalAdditionAndInventoryPurchaseCommitmentsMember