Accounting for Sharebased Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended							12 Months Ended
	Sep. 01, 2012 number	Aug. 27, 2011 number	Sep. 01, 2012 number	Aug. 27, 2011 number	Sep. 01, 2012 Non Employee Directors [Member]	Sep. 01, 2012 Employees [Member]	Sep. 01, 2012 Nonvested restricted stock units [Member]	Sep. 01, 2012 Nonvested restricted stock shares [Member]	Sep. 01, 2012 Weighted-Average Grant Date Fair Value [Member]	Dec. 03, 2011 Weighted-Average Grant Date Fair Value [Member]	Sep. 01, 2012 Nonvested restricted stock weighted-average remaining contractual life (in years) [Member]	Dec. 03, 2011 Nonvested restricted stock weighted-average remaining contractual life (in years) [Member]
Share-based Compensation [Abstract]
Expected life	4.75	4.75	4.75	4.75
Weighted-average expected volatility	50.62%	50.45%	51.75%	52.18%
Expected volatility	50.62%	50.45%
Expected volatility (Low)			50.62%	50.45%
Expected volatility (High)			51.76%	52.30%
Risk-free interest rate	0.72%	1.63%	0.71%	1.93%
Expected dividend yield	1.02%	1.17%	1.06%	1.29%
Weighted-average fair value of grants	$ 12.83	$ 10.10	$ 11.44	$ 9.21
Nonvested Restricted Activity [Line Items]
Nonvested beginning balance			398,879				127,117	271,762
Granted			209,243				88,536	120,707
Vested			(185,180)				(50,370)	(134,810)
Forfeited			(23,009)				(13,927)	(9,082)
Nonvested ending balance	399,933		399,933				151,356	248,577
Weighted Average Remaining Contractual Life Beginning											1.1	1.0
Weighted Average Remaining Contractual Life Granted											2.4
Weighted Average Remaining Contractual Life Forfeited											1.8
Weighted Average Remaining Contractual Life Vested											0
Weighted Average Remaining Contractual Life Ending											1.1	1.0
Total Nonvested Restricted Stock Weighted Average Beginning									$ 25.21	$ 23.18
Granted weighted average grant date fair value									$ 28.47
Vested weighted average grant date fair value									$ 24.58
Forfeited weighted average grant date fair value									$ 24.13
Total Nonvested Restricted Stock Weighted Average Ending									$ 25.21	$ 23.18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 47	$ 11	$ 4,552	$ 2,752
Total fair value of nonvested restricted stock	10,084		10,084
Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Units [Line Items]
Units outstanding beginning			391,833		314,560	77,273
Participant contributions			30,174		27,831	2,343
Company match contributions			2,332		1,919	413
Payouts			(18,880)		(10,333)	(8,547)
Units outstanding ending	405,459		405,459		333,977	71,482
Other Share Based Activity [Abstract]
Fair values of options granted	49	159	5,891	4,658
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	317	293	4,420	2,573
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	619	512	6,650	5,755
Repurchased restricted stock shares	710	0	53,685	31,640
Share-based compensation expense recognition [Abstract]
Share-based compensation expense	2,143	1,842	7,155	5,213
Excess tax benefit recognized	105	136	1,144	269
Unrecognized compensation costs related to unvested stock option awards	7,085		7,085
The weighted average period over which unrecognized share-based compensation costs are expected to be reported.	1.6
Unrecognized compensation costs related to unvested restricted stock awards	4,563		4,563
The weighted average period over which unrecognized compensation costs related to unvested restricted stock awards	1.1
Restricted Unit Unrecognized Costs	$ 2,235		$ 2,235
Summary of option activity [Roll Forward]
Outstanding beginning balance			2,423,366
Granted			514,900
Exercised			(383,457)
Forfeited or Cancelled			(85,366)
Outstanding ending balance	2,469,443		2,469,443
Weighted-average exercise price activity [Abstract]
Outstanding beginning balance			$ 19.29
Granted	$ 28.47		$ 28.47
Exercised	$ 17.57		$ 17.57
Forfeited or Cancelled			$ 20.89
Outstanding ending balance	$ 21.42		$ 21.42