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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. 28, 2018 USD ($) $ / shares shares | Apr. 29, 2017 USD ($) shares | Apr. 30, 2016 USD ($) 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 | $ 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 | 1,870,000 |  |
Weighted-average period for unrecognized costs | 2 years 10 months 8 days |  |
Exercisable at end of year, Shares | 1,788,000 |  |
Exercised, aggregate intrinsic value | $ | $ 65 | $ 64 | $ 132
Fair value of vested options | $ | $ 977 | $ 1,102 | $ 1,190
Stock issued for ESPP | 223,000 | 118,000 | 227,000
Nonvested unrecognized compensation expense | $ | $ 3,752 |  |
Proceeds from exercise of stock options | $ | 519 | $ 343 | $ 610
Tax benefit from share based payments | $ | $ 9 | 2 | (69)
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 13 days |  |
Fair value | $ | $ 1,274 | $ 1,214 | $ 1,191
Restricted Stock and Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation costs | $ | $ 1,226 |  |
In The Money Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (usd per share) | $ / shares | $ 9.01 |  |
Exercisable at end of year, Shares | 594,000 |  |
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 | 173,000 |  |
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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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