Stockholders' Equity (Details 3) (Vested Options, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 01, 2012	Dec. 03, 2011	Nov. 27, 2010
Vested Options
Activity under the Griffin Stock Option Plan
Outstanding at beginning of period (in shares)	54,075	45,730	71,133
Exercised (in shares)	(6,741)	(10,667)	(31,101)
Vested (in shares)	38,049	19,012	5,698
Forfeited (in shares)	(4,932)
Outstanding at end of period (in shares)	80,451	54,075	45,730
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 27.08	$ 23.18	$ 17.61
Exercised (in dollars per share)	$ 17.80	$ 17.45	$ 12.20
Vested (in dollars per share)	$ 32.19	$ 31.06	$ 32.84
Forfeited (in dollars per share)	$ 32.43
Outstanding at end of period (in dollars per share)	$ 29.95	$ 27.08	$ 23.18
Intrinsic value of options exercised (in dollars)	$ 49	$ 137	$ 468