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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. 29, 2017 USD ($) $ / shares shares | Apr. 30, 2016 USD ($) shares | May 02, 2015 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized | 120,000,000 |  |
Common purchase right per common stock | 1 |  |
Conversion ratio for rights to common stock | 0.10 |  |
Share price | $ / shares | $ 100 |  |
Days following ownership announcement option one | 10 days |  |
Percentage of ownership | 15.00% |  |
Days following ownership announcement, option two | 10 days |  |
Shares available for grant | 2,215,000 |  |
Weighted-average period for unrecognized costs | 2 years 8 months 9 days |  |
Exercisable at end of year, Shares | 1,868,000 |  |
Exercised, aggregate intrinsic value | $ | $ 64 | $ 132 | $ 533
Fair value of vested options | $ | $ 1,102 | $ 1,190 | $ 1,294
Stock issued for ESPP | 118,000 | 227,000 | 248,000
Nonvested unrecognized compensation expense | $ | $ 3,991 |  |
Proceeds from exercise of stock options | $ | 343 | $ 610 | $ 2,513
Tax benefit from share based payments | $ | $ 2 | (69) | 3
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 11 months 9 days |  |
Fair value | $ | $ 1,214 | $ 1,191 | $ 1,089
Restricted Stock and Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation costs | $ | $ 2,485 |  |
In The Money Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (usd per share) | $ / shares | $ 9.46 |  |
Exercisable at end of year, Shares | 891,000 |  |
Employee Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Shares available for grant | 2,500,000 |  |
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 | 396,000 |  |
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 |  |

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