Accounting for Sharebased Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 01, 2012	Dec. 03, 2011	Nov. 27, 2010
Assumptions to calculate fair value options [Abstract]
Expected life	4.75	4.75	5
Weighted-average expected volatility	51.60%	52.13%	50.88%
Expected volatility (Low)	48.79%	50.45%	50.80%
Expected volatility (High)	51.76%	52.30%	51.60%
Risk-free interest rate	0.71%	1.87%	2.07%
Expected dividend yield	1.05%	1.31%	1.35%
Weighted-average fair value of grants	$ 11.52	$ 9.10	$ 8.49
Share-based compensation expense recognition [Abstract]
Share-based compensation expense	$ 9,728	$ 7,741	$ 6,405
APIC Pool for tax deficiencies	12,826
Excess tax benefit recognized	1,263	1,140	509
Unrecognized compensation costs related to unvested stock option awards	6,096
The weighted average period over which unrecognized share-based compensation costs are expected to be reported.	1.4
Unrecognized compensation costs related to unvested restricted stock awards	5,657
The weighted average period over which unrecognized compensation costs related to unvested restricted stock awards	0.9
Summary of option activity [Roll Forward]
Outstanding beginning balance	2,423,366	2,820,468
Granted	548,449	535,873
Exercised	(430,000)	(538,709)	(358,421)
Forfeited or Cancelled	(112,065)	(394,266)
Outstanding ending balance	2,429,750	2,423,366	2,820,468
Weighted-average exercise price activity [Abstract]
Outstanding beginning balance	$ 19.29	$ 18.25
Granted	$ 28.75	$ 22.11
Exercised	$ 17.42	$ 14.75
Forfeited or Cancelled	$ 22.03	$ 21.87
Outstanding ending balance	$ 21.63	$ 19.29	$ 18.25
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance	398,879	477,769
Restricted shares granted	216,963	227,530
Vested	(187,598)	(203,343)
Forfeited	(41,829)	(103,077)
Nonvested ending balance	386,415	398,879	477,769
Weighted Average Remaining Contractual Life Ending	0.9
Fair value of nonvested restricted stock	4,626	4,447	1,441
Total fair value of nonvested restricted stock	9,820
Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Units [Line Items]
Units outstanding beginning	391,833	366,143
Participant contributions	19,051	24,863
Company match contributions	21,013	23,645
Payouts	(24,466)	(22,818)
Units outstanding ending	407,431	391,833	366,143
Directors Deferred Compensation 10 Percent Match	0.10
Other Share Based Activity [Abstract]
Fair values of options granted	6,318	4,878	5,327
Total intrinsic value of options exercised	5,191	4,231	3,542
Proceeds received from option exercises	7,401
Repurchased restricted stock shares	54,289	48,675	17,804
Non Employee Directors [Member]
Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Units [Line Items]
Units outstanding beginning	314,560	277,345
Participant contributions	15,836	21,406
Company match contributions	20,414	22,996
Payouts	(12,041)	(7,187)
Units outstanding ending	338,769	314,560
Deferred compensation units paid as discretionary awards	18,030	19,452
Fair value of company match	78	78	66
Fair value of discretionary award	560	490	490
Employees [Member]
Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Units [Line Items]
Units outstanding beginning	77,273	88,798
Participant contributions	3,215	3,457
Company match contributions	599	649
Payouts	(12,425)	(15,631)
Units outstanding ending	68,662	77,273
Fair value of company match	$ 14	$ 14	$ 15
Nonvested restricted stock units [Member]
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance	127,117	111,940
Restricted shares granted	88,536	82,492
Vested	(52,788)	(54,392)
Forfeited	(21,681)	(12,923)
Nonvested ending balance	141,184	127,117
Nonvested restricted stock shares [Member]
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance	271,762	365,829
Restricted shares granted	128,427	145,038	155,757
Vested	(134,810)	(148,951)
Forfeited	(20,148)	(90,154)	(10,973)
Nonvested ending balance	245,231	271,762	365,829
Weighted Average Grant Date Fair Value [Member]
Nonvested Restricted Activity [Line Items]
Total Nonvested Restricted Stock Weighted Average Beginning	$ 25.41	$ 23.18	$ 19.17
Granted weighted average grant date fair value	$ 28.64	$ 22.38
Vested weighted average grant date fair value	$ 24.66	$ 21.87
Forfeited weighted average grant date fair value	$ 24.78	$ 18.59
Total Nonvested Restricted Stock Weighted Average Ending	$ 25.41	$ 23.18	$ 19.17
Nonvested restricted stock weighted average remaining contractual life (in years) [Member]
Nonvested Restricted Activity [Line Items]
Weighted Average Remaining Contractual Life Granted	2.2	2.2
Weighted Average Remaining Contractual Life Forfeited	1.6	1.1
Weighted Average Remaining Contractual Life Vested	0	0
Weighted Average Remaining Contractual Life Ending		1.0	1.7
Stock Option [Member]
Nonvested Restricted Activity [Line Items]
Vesting Schedule		33.3%	25%
Maximum Share Based Contractual Term	10
Restricted Stock [Member]
Nonvested Restricted Activity [Line Items]
Vesting Schedule	33.3%