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Stockholders' Equity (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Dec. 01, 2012
Other Disclosures      
Total grant date fair value of options vested $ 664us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 $ 466us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 $ 523us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Nonvested Options      
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods      
Fiscal 2015 153grif_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptionsAmountOfRecognitionInYearTwo
/ grif_AwardStatusAxis
= grif_NonvestedOptionsMember		    
Fiscal 2016 $ 33grif_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptionsAmountOfRecognitionInYearThree
/ grif_AwardStatusAxis
= grif_NonvestedOptionsMember