Earnings Per Share (Calculation of Basic and Diluted Income Per Share) (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
Earnings Per Share [Abstract]
Net income	$ 11,385	$ 7,661	$ 32,124	$ 21,337
Weighted average shares outstanding	27,209	27,987	27,552	28,128
Net income per share - basic (in dollars per share)	$ 0.42	$ 0.27	$ 1.17	$ 0.76
Dilutive impact of awards and options outstanding	110	100	114	90
Weighted average shares and potential dilutive shares outstanding	27,319	28,087	27,666	28,218
Net income per share - assuming dilution (in dollars per share)	$ 0.42	$ 0.27	$ 1.16	$ 0.76