Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 02, 2012	Oct. 28, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 1,869	$ 2,547
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	88	408
Nonvested Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	1,167	1,539
Performance-based market stock unit ("MSU") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 614	$ 600