Incentive Plans and Stock-Based Compensation (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 03, 2011	Nov. 27, 2010	Nov. 28, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits (expense) associated with tax deductions over (under) the amount of compensation expense recognized in the consolidated condensed financial statements	$ 5,100	$ 2,457	$ 1,809
Stock Issued During Period, Value, Restricted Stock Award And Employee Stock Purchase Plan And Share Based Compensation	2,001	1,770	1,759
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	4,397	3,632	3,027
Deferred tax benefits	(1,616)	(1,335)	(969)
Excess tax benefits (expense) associated with tax deductions over (under) the amount of compensation expense recognized in the consolidated condensed financial statements	5,100	2,500	1,881
Fair value of share-based awards on date of grant	5,803	4,213	3,551
Total intrinsic value of stock options exercised	16,732	7,547	4,975
Cash received upon exercise of stock options	7,233	5,703	2,479
Tax benefit realized from exercise of stock options, net	5,100	2,457	1,809
Addition to capital in excess of par value due to exercise of stock options	8,045	7,313	3,164
Unrecognized compensation cost related to share-based awards which the Company expects to recognize	4,068
Weighted-average period in years, over which the Company expects to recognize compensation cost related to share-based arrangements	2.44
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted average fair value per option at the date of grant for option granted	$ 11.73	$ 8.73	$ 7.62
Risk-free interest rate	2.52%	2.84%	1.91%
Expected dividend yield	0.98%	1.02%	1.25%
Expected volatility factor	25.54%	26.00%	24.16%
Expected option term in years	6.4	6.2	6.1
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	1,079	970	1,061
Deferred tax benefits	(396)	(357)	(339)
Excess tax benefits (expense) associated with tax deductions over (under) the amount of compensation expense recognized in the consolidated condensed financial statements	3	(111)	(27)
Fair value of share-based awards on date of grant	1,263	1,102	1,192
Fair value of restricted stock unit awards vested	905	983	790
Unrecognized compensation cost related to share-based awards which the Company expects to recognize	786
Weighted-average period in years, over which the Company expects to recognize compensation cost related to share-based arrangements	2.4
Directors' Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	200	240	210
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	4,540	6,760	8,298
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, Restricted Stock Award And Employee Stock Purchase Plan And Share Based Compensation	$ 1,216	$ 1,096	$ 1,138