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Shareholders' Equity and Share-Based Compensation (Details Textual) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2022 USD ($) $ / shares shares | May 01, 2021 USD ($) shares | May 02, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized and undesignated (in shares) | 120,000,000 |  |
Common stock, shares authorized (in shares) | 115,000,000 | 115,000,000 |
Preferred stock, shares authorized (in shares) | 50,000 | 50,000 |
Common stock, shares undesignated (in shares) | 4,950,000 |  |
Number of preferred share purchase right | 1 |  |
Common share rights exercise, period | 10 days |  |
Sale of stock, percentage of ownership after transaction | 20.00% |  |
Common share rights exercise, period | 10 years |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) | 2,456,000 |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, amount | $ | $ 1,772 |  |
Share-based payment arrangement, nonvested award, cost not yet recognized | 2 years 8 months 15 days |  |
Exercisable shares (in shares) | 1,371,000 |  |
Option, exercise price range, upper range limit (in dollars per share) | $ / shares | $ 3.35 |  |
Exercised, aggregate intrinsic value | $ | $ 2 | $ 0 | $ 0
Fair value of stock potions vested | $ | $ 465 | $ 451 | $ 566
Stock issued during period, shares, employee stock purchase plans (in shares) | 310,000 | 170,000 | 453,000
Share-based compensation expense | $ | $ 2,862 |  |
Proceeds from stock options exercised | $ | 8 | $ 0 | $ 0
Share-based payment arrangement, expense, tax benefit | $ | $ (47) | 70 | 92
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 1 year |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) | 4,000,000 |  |
Maximum employee subscription rate | 15.00% |  |
Discount from market price, offering date | 85.00% |  |
Common stock, capital shares reserved for future issuance (in shares) | 705,000 |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, expiration period | 10 years |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 5 years |  |
Stock options | Independent Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, expiration period | 7 years |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 1 year |  |
Restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of restricted stock vested | $ | $ 1,203 | $ 1,293 | $ 1,415
Restricted stock | Independent Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 1 year |  |
Restricted stock | Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 5 years |  |
In money options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercisable shares (in shares) | 0 |  |
Preferred Share Purchase Right |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of securities called by each warrant or right (in shares) | 0.001 |  |
Initial exercise price (in dollars per share) | $ / shares | $ 20 |  |

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