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Share-Based Compensation, Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 03, 2018
Jul. 28, 2017
Jul. 29, 2016
Compensation Expense [Abstract]      
Total compensation expense $ 6,977 $ 8,458 $ 13,202
Total income tax benefit recognized [Abstract]      
Total income tax benefit $ 774 2,740 3,819
Number of shares issued from vesting of share-based compensation awards and stock option exercises (in shares) 55,868    
Tax withholding payment net of cash received from issuance of share based compensation awards $ (3,816) (6,896) (5,779)
Nonvested Stock Awards and Units [Member]      
Compensation Expense [Abstract]      
Total compensation expense 6,052 6,654 10,277
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 $ 3,189    
Weighted average period in years 1 year 9 months 25 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 $ 1,341    
Weighted average period in years 1 year 8 months 16 days    
MSU Grants [Member]      
Compensation Expense [Abstract]      
Total compensation expense $ 925 $ 1,804 $ 2,925