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Shareholders' Equity and Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 27, 2019 USD ($) $ / shares shares | Apr. 28, 2018 USD ($) shares | Apr. 29, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized | 120,000,000 |  |
Common purchase right per common stock | 1 |  |
Share price | $ / shares | $ 25 |  |
Days following ownership announcement option one | 10 days |  |
Percentage of ownership | 20.00% |  |
Days following ownership announcement, option two | 10 days |  |
Shares available for grant | 1,536,000 |  |
Weighted-average period for unrecognized costs | 2 years 10 months 8 days |  |
Exercisable at end of year, Shares | 1,684,000 |  |
Exercised, aggregate intrinsic value | $ | $ 98 | $ 65 | $ 64
Fair value of vested options | $ | $ 667 | $ 977 | $ 1,102
Stock issued for ESPP | 241,000 | 223,000 | 118,000
Nonvested unrecognized compensation expense | $ | $ 3,306 |  |
Proceeds from exercise of stock options | $ | 1,318 | $ 519 | $ 343
Tax benefit from share based payments | $ | $ (52) | 9 | 2
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award life | 10 years |  |
Vesting period | 5 years |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 5 years |  |
Weighted-average period for unrecognized costs | 2 years 9 months 5 days |  |
Fair value | $ | $ 1,530 | $ 1,274 | $ 1,214
Restricted Stock and Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation costs | $ | $ 2,286 |  |
In The Money Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (usd per share) | $ / shares | $ 7.30 |  |
Exercisable at end of year, Shares | 0 |  |
Employee Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Shares available for grant | 4,000,000 |  |
Requisite service period | 6 months |  |
Employee maximum contribution percentage | 15.00% |  |
Percentage of purchase price at the lower of the fair market value | 85.00% |  |
Purchase discount percentage | 15.00% |  |
Shares reserved for future issuance | 1,433,000 |  |
Independent Directors | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award life | 7 years |  |
Vesting period | 1 year |  |
Independent Directors | Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized | 115,000,000 |  |
Undesignated Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized | 5,000,000 |  |
Series A Junior Participating Preferred Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common purchase right per common stock | 0.001 |  |

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