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

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Share-Based Compensation (Detail) - USD ($)			3 Months Ended		6 Months Ended
Share-Based Compensation (Detail) - USD ($)	Jul. 25, 2019	Jul. 27, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Share-based Compensation Expense			$ 300,000		$ 300,000
Unrecognized Share-based Compensation, Period for Recognition					1 year 9 months 18 days
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SARs Granted	170,000	161,250
Strike Price	$ 4.93	$ 8.17
Fair Value	$ 1.23	$ 2.27
Share-based Compensation Expense			$ 67,000	$ 106,000	$ 141,000	$ 274,000