Stockholders' Equity (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 01, 2012
Vested Options
Griffin Stock Option Plan
Outstanding at ending of the year (in shares)	80,451
Weighted Avg. Exercise Price (in dollars per share)	$ 29.95
Weighted Avg. Contractual Life	5 years 1 month 6 days
Total Intrinsic Value	$ 94
Nonvested Options
Griffin Stock Option Plan
Outstanding at ending of the year (in shares)	163,390
Weighted Avg. Exercise Price (in dollars per share)	$ 29.84
Weighted Avg. Contractual Life	7 years 7 months 6 days
Total Intrinsic Value	11
$11.00-$12.00 | Vested Options
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 11.00
Exercise prices, high end of range (in dollars per share)	$ 12.00
Outstanding at ending of the year (in shares)	6,776
Weighted Avg. Exercise Price (in dollars per share)	$ 11.81
Weighted Avg. Contractual Life	6 months
Total Intrinsic Value	92
$23.00-$32.00 | Vested Options
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 23.00
Exercise prices, high end of range (in dollars per share)	$ 32.00
Outstanding at ending of the year (in shares)	28,934
Weighted Avg. Exercise Price (in dollars per share)	$ 28.38
Weighted Avg. Contractual Life	4 years 8 months 12 days
Total Intrinsic Value	2
$32.00-$39.00 | Vested Options
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 32.00
Exercise prices, high end of range (in dollars per share)	$ 39.00
Outstanding at ending of the year (in shares)	44,741
Weighted Avg. Exercise Price (in dollars per share)	$ 33.72
Weighted Avg. Contractual Life	6 years
$23.00-$29.00 | Nonvested Options
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 23.00
Exercise prices, high end of range (in dollars per share)	$ 29.00
Outstanding at ending of the year (in shares)	115,056
Weighted Avg. Exercise Price (in dollars per share)	$ 28.41
Weighted Avg. Contractual Life	8 years 2 months 12 days
Total Intrinsic Value	$ 11
$33.00-$35.00 | Nonvested Options
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 33.00
Exercise prices, high end of range (in dollars per share)	$ 35.00
Outstanding at ending of the year (in shares)	48,334
Weighted Avg. Exercise Price (in dollars per share)	$ 33.24
Weighted Avg. Contractual Life	6 years