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Share-Based Compensation, Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 02, 2019
Aug. 03, 2018
Jul. 28, 2017
Compensation Expense [Abstract]      
Total compensation expense $ 8,181 $ 6,977 $ 8,458
Total income tax benefit recognized [Abstract]      
Total income tax benefit $ 1,317 774 2,740
Number of shares issued from vesting of share-based compensation awards (in shares) 37,690    
Tax withholding payment net of cash received from issuance of share based compensation awards $ (2,497) (3,816) (6,896)
Nonvested Stock Awards and Units [Member]      
Compensation Expense [Abstract]      
Total compensation expense 8,181 6,052 6,654
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 $ 3,496    
Weighted average period in years 1 year 8 months 23 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 $ 1,363    
Weighted average period in years 1 year 8 months 1 day    
MSU Grants [Member]      
Compensation Expense [Abstract]      
Total compensation expense $ 0 $ 925 $ 1,804