Accounting for Sharebased Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 29, 2015	Aug. 30, 2014
Assumptions to calculate fair value options [Abstract]
Expected life		4 years 9 months	4 years 7 months 10 days	4 years 9 months
Weighted-average expected volatility		31.68%	30.91%	34.13%
Expected volatility		31.68%
Expected volatility (Low)			25.50%	31.68%
Expected volatility (High)			31.67%	37.06%
Risk-free interest rate		1.61%	1.26%	1.52%
Expected dividend yield		0.96%	1.17%	0.82%
Weighted-average fair value of grants		$ 12.89	$ 10.21	$ 14.19
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance			377,283
Granted			142,260
Vested			(149,627)
Forfeited			(18,696)
Nonvested ending balance	351,220		351,220
WeightedAverageRemainingContractualLife			1 year	1 year
Weighted Average Remaining Contractual Life Granted			1 year 4 months 24 days
Weighted Average Remaining Contractual Life Forfeited			1 year 1 month 6 days
Weighted Average Remaining Contractual Life Vested
WeightedAverageRemainingContractualLife			1 year	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 57,000	$ 217,000	$ 6,121,000	$ 8,758,000
Total fair value of nonvested restricted stock	$ 14,836,000		$ 14,836,000
Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Units [Line Items]
Units outstanding beginning			394,850
Participant contributions			18,750
Company match contributions			21,880
Payouts			(10,905)
Units outstanding ending	424,575		424,575
Other Share Based Activity [Abstract]
Fair values of options granted	$ 0	73,000	$ 7,189,000	5,972,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	1,565,000	1,925,000	5,114,000	6,855,000
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	$ 391,000	$ 1,680,000	$ 4,342,000	$ 6,331,000
Repurchased restricted stock shares	193	1,095	54,196	67,407
Share-based compensation expense recognition [Abstract]
Share-based compensation expense	$ 3,006,000	$ 3,015,000	$ 10,325,000	$ 10,163,000
Excess tax benefit recognized	411,000	$ 673,000	1,321,000	$ 3,123,000
Unrecognized compensation costs related to unvested stock option awards	8,459,000		$ 8,459,000
The weighted average period over which unrecognized share-based compensation costs are expected to be reported.			1 year 2 months 14 days
Unrecognized compensation costs related to unvested restricted stock awards	1,420,000		$ 1,420,000
The weighted average period over which unrecognized compensation costs related to unvested restricted stock awards			8 months 12 days
Restricted Unit Unrecognized Costs	$ 6,687,000		$ 6,687,000
Sharebased Compensation Arrangement By Sharebased Payment Restrict Unit Award Weighted Average Remaining Contractual Term			1 year 2 months 14 days
Summary of option activity [Roll Forward]
Outstanding beginning balance			2,534,473
Granted			704,180
Exercised			(261,914)
Forfeited or Cancelled			(88,971)
Outstanding ending balance	2,887,768		2,887,768
Weighted-average exercise price activity [Abstract]
Outstanding beginning balance			$ 30.39
Granted			41.17
Exercised			22.69
Forfeited or Cancelled			42.15
Outstanding ending balance	$ 33.36		$ 33.36
Nonvested restricted stock units [Member]
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance			188,661
Granted			142,260
Vested			(82,333)
Forfeited			(9,814)
Nonvested ending balance	238,774		238,774
Nonvested restricted stock shares [Member]
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance			188,622
Granted			0
Vested			(67,294)
Forfeited			(8,882)
Nonvested ending balance	112,446		112,446
Weighted-Average Grant Date Fair Value [Member]
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance			40.7
Granted			41
Vested			37.53
Forfeited			40.05
Nonvested ending balance	42.24		42.24
Non Employee Directors [Member]
Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Units [Line Items]
Units outstanding beginning			342,547
Participant contributions			15,136
Company match contributions			21,519
Payouts			(325)
Units outstanding ending	378,877		378,877
Employees [Member]
Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Units [Line Items]
Units outstanding beginning			52,303
Participant contributions			3,614
Company match contributions			361
Payouts			(10,580)
Units outstanding ending	45,698		45,698