Stockholders' Equity (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Dec. 01, 2012	Dec. 03, 2011	Nov. 28, 2009
Employee and directors' stock options
Other Disclosures
Number of option holders	17
2009 Stock Option Plan
Griffin Stock Option Plan
Granted (in shares)	8,112	10,996	113,212
2009 Stock Option Plan | Employee and directors' stock options
Griffin Stock Option Plan
Number of shares authorized				386,926
Number of shares available for issuance under prior plans included in total shares authorized				161,926
Expiration term	10 years
Granted (in shares)	8,112	10,996	113,212
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)	40.30%
Range of risk free interest rate (as a percent)	1.33%
Expected option term	8 years 6 months	8 years 6 months
Annual dividend yield (as a percent)	0.70%		1.40%
Compensation expense for stock options
Compensation expense	$ 467	$ 604	$ 564
Related tax benefit	$ 114	$ 148	$ 138
Other Disclosures
Forfeiture rates (as a percent)	0.00%	22.60%	41.10%
2009 Stock Option Plan | Employee and directors' stock options | Minimum
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)		39.60%	42.00%
Range of risk free interest rate (as a percent)		1.02%	2.06%
Expected option term			5 years
Annual dividend yield (as a percent)		0.00%
2009 Stock Option Plan | Employee and directors' stock options | Maximum
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)		41.10%	43.40%
Range of risk free interest rate (as a percent)		1.19%	2.81%
Expected option term			8 years 6 months
Annual dividend yield (as a percent)		0.70%
2009 Stock Option Plan | Employee and directors' stock options | Non-employee directors
Griffin Stock Option Plan
Fair values of stock options granted (in dollars per share)	$ 12.94		$ 12.03
Granted (in shares)	8,112	10,996	8,712
2009 Stock Option Plan | Employee and directors' stock options | Non-employee directors | Minimum
Griffin Stock Option Plan
Fair values of stock options granted (in dollars per share)		$ 10.66
2009 Stock Option Plan | Employee and directors' stock options | Non-employee directors | Maximum
Griffin Stock Option Plan
Fair values of stock options granted (in dollars per share)		$ 14.89
2009 Stock Option Plan | Employee and directors' stock options | Employees
Griffin Stock Option Plan
Granted (in shares)			104,500
2009 Stock Option Plan | Employee and directors' stock options | Employees | Minimum
Griffin Stock Option Plan
Fair values of stock options granted (in dollars per share)			$ 10.37
2009 Stock Option Plan | Employee and directors' stock options | Employees | Maximum
Griffin Stock Option Plan
Fair values of stock options granted (in dollars per share)			$ 12.88