Share-Based Compensation, Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Jul. 31, 2020	Aug. 02, 2019	Aug. 03, 2018
Compensation Expense [Abstract]
Total compensation expense	$ 6,386	$ 8,181	$ 6,977
Total income tax benefit recognized [Abstract]
Total income tax benefit	$ 1,120	1,317	774
Number of shares issued from vesting of share-based compensation awards (in shares)	27,130
Tax withholding payment net of cash received from issuance of share based compensation awards	$ (2,160)	$ (2,497)	$ (3,816)
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	$ 3,852
Weighted average period in years	1 year 8 months 1 day
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	$ 1,503
Weighted average period in years	1 year 7 months 28 days

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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