Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Percentage of vesting of share-based compensation awards.

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Long-Term Incentive Awards (Details) - USD ($)	3 Months Ended			12 Months Ended
Long-Term Incentive Awards (Details) - USD ($)	Jul. 27, 2019	Jul. 28, 2018	Jul. 29, 2017	Apr. 30, 2019
Stock Based Compensation
Stock based compensation expense	$ 1,600,000			$ 1,429,000
Fiscal 2020 LTIP
Stock Based Compensation
Stock based compensation expense		$ 0
Fiscal 2020 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense	$ 131,000
Exercisable period from grant date	3 years
Fiscal 2020 LTIP \| Performance based restricted stock units \| 100% Vested
Stock Based Compensation
Vesting (as a percentage)	100.00%
Fiscal 2020 LTIP \| Performance based restricted stock units \| 50% Vested
Stock Based Compensation
Vesting (as a percentage)	50.00%
Fiscal 2020 LTIP \| Performance based restricted stock units \| 200% Vested
Stock Based Compensation
Vesting (as a percentage)	200.00%
Fiscal 2020 LTIP \| Performance based restricted stock units \| Maximum
Stock Based Compensation
Stock based compensation expense	$ 4,696,000
Fiscal 2019 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense	33,000	$ 44,000
Exercisable period from grant date		3 years
Fiscal 2019 LTIP \| Performance based restricted stock units \| 100% Vested
Stock Based Compensation
Vesting (as a percentage)		100.00%
Fiscal 2019 LTIP \| Performance based restricted stock units \| 50% Vested
Stock Based Compensation
Vesting (as a percentage)		50.00%
Fiscal 2019 LTIP \| Performance based restricted stock units \| 200% Vested
Stock Based Compensation
Vesting (as a percentage)		200.00%
Fiscal 2019 LTIP \| Performance based restricted stock units \| Maximum
Stock Based Compensation
Stock based compensation expense	2,933,000
Fiscal 2018 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense	$ 8,000	$ 490,000
Exercisable period from grant date	3 years
Fiscal 2018 LTIP \| Performance based restricted stock units \| 100% Vested
Stock Based Compensation
Vesting (as a percentage)			100.00%
Fiscal 2018 LTIP \| Performance based restricted stock units \| 50% Vested
Stock Based Compensation
Vesting (as a percentage)			50.00%
Fiscal 2018 LTIP \| Performance based restricted stock units \| 200% Vested
Stock Based Compensation
Vesting (as a percentage)			200.00%
Fiscal 2018 LTIP \| Performance based restricted stock units \| Maximum
Stock Based Compensation
Stock based compensation expense	$ 2,180,000
Fiscal 2017 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense	$ 0
Exercisable period from grant date				3 years
Issue of fully-vested shares of common stock to settle	14,814