Stockholders' Equity (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Dec. 01, 2012	Nov. 27, 2010
Weighted Avg. Exercise Price
Intrinsic value of options exercised (in dollars)	$ 10	$ 114	$ 49
2009 Stock Option Plan
Activity under the Griffin Stock Option Plan
Outstanding at beginning of period (in shares)	239,677	243,841		244,518
Granted (in shares)	8,532	8,112	10,996
Exercised (in shares)	(3,208)	(6,776)	(6,741)
Forfeited (in shares)	(23,000)	(5,500)	(4,932)
Outstanding at end of period (in shares)	222,001	239,677	243,841	244,518
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 30.35	$ 29.88		$ 29.79
Granted (in dollars per share)	$ 28.12	$ 29.58	$ 25.45
Exercised (in dollars per share)	$ 24.94	$ 11.81	$ 17.80
Forfeited (in dollars per share)	$ 30.27	$ 31.12	$ 32.43
Outstanding at end of period (in dollars per share)	$ 30.35	$ 30.35	$ 29.88	$ 29.79