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Long-Term Incentive Awards (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 27, 2019 | Jul. 28, 2018 | Apr. 30, 2017 | Apr. 30, 2020 | Apr. 25, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Stock Based Compensation |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | $ 6,227,000 |  | $ 6,985,000 | $ 4,956,000
Performance based restricted stock units | 100% Vested |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Vesting (as a percentage) |  |  |  |  | 100.00% |  |  |
Performance based restricted stock units | 50% Vested |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Vesting (as a percentage) |  |  |  |  | 50.00% |  |  |
Performance based restricted stock units | 200% Vested |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Vesting (as a percentage) |  |  |  |  | 200.00% |  |  |
Performance based restricted stock units | Maximum |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | $ 4,263,000 |  |  |
LTIP |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | 2,657,000 |  | 1,889,000 |
Fiscal 2020 LTIP |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | 649,000 |  |  |
Fiscal 2019 LTIP | Performance based restricted stock units |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | 386,000 |  | 572,000 |
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 |  |  |  |  | 2,478,000 |  |  |
Fiscal 2018 LTIP |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Issue of fully-vested shares of common stock to settle |  | 14,814 |  |  |  |  |  |
Fiscal 2018 LTIP | Performance based restricted stock units |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | $ 193,000 |  | 588,000 | $ 269,000
Issue of fully-vested shares of common stock to settle | 27,356 |  |  |  |  |  |  |
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 2017 LTIP |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  | $ 0 | $ 0 |

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