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Share-Based Compensation, Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 28, 2017
Jul. 29, 2016
Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total compensation expense $ 8,458 $ 13,202 $ 16,210
Total income tax benefit recognized [Abstract]      
Total income tax benefit $ 2,740 3,819 5,056
Number of shares issued from vesting of share-based compensation awards and stock option exercises (in shares) 99,548    
Tax withholding payment net of cash received from issuance of share based compensation awards $ (6,896) (5,779) (4,816)
Excess tax benefit realized upon exercise of share-based compensation awards 2,636    
Nonvested Stock Awards and Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total compensation expense 6,654 10,277 13,243
Nonvested Stock Awards [Member]      
Total unrecognized compensation expense and weighted-average periods over which the expense is expected to be recognized [Abstract]      
Total unrecognized compensation $ 2,692    
Weighted average period in years 2 years 1 month 13 days    
Nonvested Stock Units [Member]      
Total unrecognized compensation expense and weighted-average periods over which the expense is expected to be recognized [Abstract]      
Total unrecognized compensation $ 770    
Weighted average period in years 2 years 4 days    
MSU Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total compensation expense $ 1,804 $ 2,925 $ 2,967
Total unrecognized compensation expense and weighted-average periods over which the expense is expected to be recognized [Abstract]      
Total unrecognized compensation $ 862    
Weighted average period in years 1 year 7 days