Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 01, 2013	Jan. 27, 2012	Feb. 01, 2013	Jan. 27, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 3,540	$ 3,399	$ 5,409	$ 5,946
Nonvested Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	2,997	2,526	4,164	4,065
Performance-based market stock unit ("MSU Grants") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	543	436	1,157	1,035
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 0	$ 437	$ 88	$ 846