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Long-Term Incentive Awards (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2020 | Jul. 31, 2021 | Aug. 01, 2020 | Jul. 27, 2019 | Jul. 28, 2018 | Jul. 30, 2017 | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | $ 5,390,000 | $ 6,932,000 | $ 6,227,000
Exercisable period from grant date |  |  |  |  |  |  | 3 years |  |
LTIP |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | $ 4,594,000 | 5,177,000 |
Fiscal 2022 LTIP | Performance based restricted stock units |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | 752,000 |  |
Exercisable period from grant date |  | 3 years |  |  |  |  |  |  |
Fiscal 2022 LTIP | Performance based restricted stock units | 100% Vested |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Vesting (as a percentage) |  | 100.00% |  |  |  |  |  |  |
Fiscal 2022 LTIP | Performance based restricted stock units | 50% Vested |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Vesting (as a percentage) |  | 50.00% |  |  |  |  |  |  |
Fiscal 2022 LTIP | Performance based restricted stock units | 250% Vested |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Vesting (as a percentage) |  | 250.00% |  |  |  |  |  |  |
Fiscal 2022 LTIP | Performance based restricted stock units | Maximum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | 10,473,000 |  |
Fiscal 2021 LTIP | Performance based restricted stock units |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | (634,000) | 1,072,000 |
Exercisable period from grant date |  |  | 3 years |  |  |  |  |  |
Fiscal 2021 LTIP | Performance based restricted stock units | 100% Vested |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Vesting (as a percentage) |  |  | 100.00% |  |  |  |  |  |
Fiscal 2021 LTIP | Performance based restricted stock units | 50% Vested |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Vesting (as a percentage) |  |  | 50.00% |  |  |  |  |  |
Fiscal 2021 LTIP | Performance based restricted stock units | 250% Vested |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Vesting (as a percentage) |  |  | 250.00% |  |  |  |  |  |
Fiscal 2021 LTIP | Performance based restricted stock units | Maximum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | 6,021,000 |  |
Fiscal 2020 LTIP | Performance based restricted stock units |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | (701,000) | 620,000 | 649,000
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 |  |  |  |  |  |  | 3,335,000 |  |
Fiscal 2019 LTIP |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | 0 |  |
Fiscal 2019 LTIP | Performance based restricted stock units |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | 368,000 | 386,000 |
Exercisable period from grant date |  |  |  |  | 3 years |  |  |  |
Issue of fully-vested shares of common stock to settle |  | 12,101 |  |  |  |  |  |  |
Fiscal 2018 LTIP | Performance based restricted stock units |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  |  | $ 0 | $ 0 | $ 193,000
Exercisable period from grant date |  |  |  |  |  | 3 years |  |  |
Issue of fully-vested shares of common stock to settle | 16,228 |  |  |  |  |  |  |  |

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