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Share-Based Compensation (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Jul. 24, 2020	Jul. 25, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 26, 2020	Dec. 28, 2019	Jul. 23, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Share-based Compensation Expense			$ 400,000		$ 400,000
Unrecognized Share-based Compensation, Period for Recognition					2 years 1 month 20 days
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SARs Granted	155,000	175,000
Strike Price		$ 4.93					$ 6.94
Fair Value	$ 2.32	$ 1.23
Share-based Compensation Expense			$ 51,000	$ 67,000	$ 114,000	$ 141,000

X

- Definition

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

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-Topic 718
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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