Share-Based Compensation, Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 29, 2016	Jul. 31, 2015	Aug. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total compensation expense	$ 13,202	$ 16,210	$ 7,924
Total income tax benefit recognized [Abstract]
Total income tax benefit	$ 3,819	5,056	2,438
Number of shares issued from vesting of share-based compensation awards and stock option exercises (in shares)	80,379
Tax withholding payment net of cash received from issuance of share based compensation awards	$ (5,779)	(4,816)	(8,457)
Excess tax benefit realized upon exercise of share-based compensation awards	2,626
Nonvested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total compensation expense	10,277	13,243	5,762
Total unrecognized compensation expense and weighted-average periods over which the expense is expected to be recognized [Abstract]
Total unrecognized compensation	$ 1,521
Weighted average period in years	2 years 5 months 23 days
MSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total compensation expense	$ 2,925	$ 2,967	$ 2,162
Total unrecognized compensation expense and weighted-average periods over which the expense is expected to be recognized [Abstract]
Total unrecognized compensation	$ 2,958
Weighted average period in years	1 year 7 months 28 days