Stockholders' Equity (Details 6) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Dec. 01, 2012
Investment in Centaur Media
Shares of common stock held in Centaur Media	1,952,462us-gaap_InvestmentOwnedBalanceShares		5,277,150us-gaap_InvestmentOwnedBalanceShares
Shares of Centaur Media common stock sold	500,000grif_InvestmentOwnedSharesSold	2,824,688grif_InvestmentOwnedSharesSold
Increase (decrease) in other comprehensive income to recognize changes in funded status of a defined benefit postretirement plan		$ 68	$ (48)
Change in accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	(449)
Other comprehensive (loss) income before reclassfications	(510)	478	(163)
Reclassifications included in net (loss) income	124	(206)	420
Net current period activity for other comprehensive loss	(386)	272	257
Balance at the end of the period	(835)	(449)
Reclassifications included in net income (loss):
Realized gain on sale of Centaur Media (gain on sale)	(321)	(1,099)
Termination of postretirement benefits program	(485)
Loss on cash flow hedges (interest expense)	1,003	810	666
Total reclassifications included in net income (loss)	197	(289)	666
Mark to market adjustment on Centaur Media for an increase (decrease) in the foreign currency exchange rate	358	481	1,111
Mark to market adjustment on Centaur Media for an increase in fair value	(73)	(1)	110
Increase (decrease) in fair value adjustment on Griffin's cash flow hedges	(1,103)	159	(1,442)
Actuarial gain (loss) on postretirement benefits program		108	(77)
Total change in other comprehensive income (loss)	(818)	747	(298)
Total other comprehensive income (loss)	(621)	458	368
Reclassifications included in net income (loss):
Realized gain on sale of Centaur Media (gain on sale)	117	383
Termination of postretirement benefits program tax	181
Loss on cash flow hedges (interest expense)	(371)	(300)	(246)
Total reclassifications included in net income (loss)	(73)	83	(246)
Mark to market adjustment on Centaur Media for an increase (decrease) in the foreign currency exchange rate	(125)	(169)	(389)
Mark to market adjustment on Centaur Media for an increase in fair value	25	(1)	(38)
Increase (decrease) in fair value adjustment on Griffin's cash flow hedges	408	(59)	533
Actuarial gain (loss) on postretirement benefits program		(40)	29
Total change in other comprehensive income (loss)	308	(269)	135
Total income tax (expense) benefit included in other comprehensive (loss) income	235	(186)	(111)
Reclassifications included in net income (loss):
Realized gain on sale of Centaur Media (gain on sale)	(204)	(716)
Termination of postretirement benefits program net of tax	(304)
Loss on cash flow hedges (interest expense)	632	510	420
Total reclassifications included in net income (loss)	124	(206)	420
Mark to market adjustment on Centaur Media for an increase (decrease) in the foreign currency exchange rate	233	312	722
Mark to market adjustment on Centaur Media for an increase in fair value	(48)	(2)	72
Increase (decrease) in fair value adjustment on Griffin's cash flow hedges	(695)	100	(909)
Actuarial gain (loss) on postretirement benefits program		68	(48)
Other comprehensive income (loss) before reclassifications	(510)	478	(163)
Total other comprehensive (loss) income, net of tax	(386)	272	257
Cash Dividend
Cash dividends declared (in dollars per share)	$ 0.20	$ 0.20	$ 0.20
Treasury Stock
Treasury stock received in connection with exercise of stock options (in shares)			1,355us-gaap_TreasuryStockSharesAcquired
Increase in treasury stock			40
Unrealized gain (loss) on cash flow hedges
Change in accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	(1,401)
Other comprehensive (loss) income before reclassfications	(695)
Reclassifications included in net (loss) income	632
Net current period activity for other comprehensive loss	(63)
Balance at the end of the period	(1,464)
Reclassifications included in net income (loss):
Total reclassifications included in net income (loss)	632
Other comprehensive income (loss) before reclassifications	(695)
Unrealized gain (loss) on investment in Centaur Media
Change in accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	648
Other comprehensive (loss) income before reclassfications	185
Reclassifications included in net (loss) income	(204)	716
Net current period activity for other comprehensive loss	(19)
Balance at the end of the period	629	648
Reclassifications included in net income (loss):
Total reclassifications included in net income (loss)	(204)	716
Other comprehensive income (loss) before reclassifications	185
Actuarial gain on postretirement benefit program
Change in accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	304
Reclassifications included in net (loss) income	(304)
Net current period activity for other comprehensive loss	(304)
Reclassifications included in net income (loss):
Total reclassifications included in net income (loss)	$ (304)

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