Stockholders' Equity (Details 2) (2009 Stock Option Plan, USD $)	6 Months Ended
	May 31, 2014	Jun. 01, 2013
Griffin Stock Option Plan
Granted (in shares)	8,532	8,112
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)	38.90%	40.30%
Risk free interest rate (as a percent)	2.16%	1.33%
Expected option term	8 years 6 months	8 years 6 months
Annual dividend yield (as a percent)	20.00%	20.00%
Non-employee directors
Griffin Stock Option Plan
Granted (in shares)	8,532	8,112
Fair values of stock options granted (in dollars per share)	$ 12.42	$ 12.94
Employee and directors' stock options
Griffin Stock Option Plan
Expiration term	10 years