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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Nov. 30, 2013
Dec. 01, 2012
Investments    
Pre Tax Gain on sale of investment $ 3,397us-gaap_CostMethodInvestmentsRealizedGainLoss  
SNHC    
Investments    
Equity interest in cost method investment (as a percent)   14.00%grif_CostMethodInvestmentOwnershipPercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grif_SheminNurseriesHoldingCorpMember
Total cash proceeds from sale of investment 3,418grif_TotalProceedsFromSaleOfCostMethodInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grif_SheminNurseriesHoldingCorpMember		  
Pre Tax Gain on sale of investment $ 3,397us-gaap_CostMethodInvestmentsRealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grif_SheminNurseriesHoldingCorpMember