Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 03, 2013	Apr. 27, 2012	May 03, 2013	Apr. 27, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 5,587	$ 3,484	$ 10,996	$ 9,430
Nonvested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	5,074	2,774	9,238	6,839
Performance-Based Market Stock Units ("MSU Grants") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	513	491	1,670	1,526
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 0	$ 219	$ 88	$ 1,065