Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2014	Jun. 01, 2013	May 31, 2014	Jun. 01, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 13,020	$ 11,989
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,230	1,329	4,426	4,097
Stock-based compensation expense, tax benefit	440	483	1,603	1,487
Weighted-average grant-date fair values of the stock options granted			$ 14.98	$ 15.33
Unrecognized share-based compensation cost	9,347		9,347
Unrecognized share-based compensation weighted average period			1 year 8 months 12 days
Total intrinsic value of options exercised			11,623	15,140
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,979	2,024	6,969	6,301
Unrecognized share-based compensation cost	17,943		17,943
Unrecognized share-based compensation weighted average period			2 years 2 months 12 days
Restricted Stock Unit Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	544	532	1,625	1,591
Unrecognized share-based compensation cost	$ 2,376		$ 2,376
Unrecognized share-based compensation weighted average period			1 year 9 months 18 days