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Long-Term Incentive Awards (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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 |  |  |

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