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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. 30, 2016 USD ($) $ / shares shares | May 02, 2015 USD ($) shares | Apr. 26, 2014 USD ($) shares | May 01, 2010
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 | 2,602,000 |  |  |
Weighted-average period for unrecognized costs | 2 years 8 months 9 days |  |  |
Exercisable at end of year, Shares | 1,920,000 |  |  |
Exercised, aggregate intrinsic value | $ | $ 132 | $ 533 | $ 1,534 |
Fair value of vested options | $ | $ 1,190 | $ 1,294 | $ 1,541 |
Stock issued for ESPP | 227,000 | 248,000 | 195,000 |
Nonvested unrecognized compensation expense | $ | $ 4,450 |  |  |
Proceeds from exercise of stock options | $ | 610 | $ 2,513 | $ 4,954 |
Tax benefit from share based payments | $ | $ (69) | 3 | (126) |
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 23 days |  |  |
Fair value | $ | $ 1,191 | $ 1,089 | $ 804 |
Restricted Stock and Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs | $ | $ 2,555 |  |  |
In The Money Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price (usd per share) | $ / shares | $ 8.70 |  |  |
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 | 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 | 514,000 |  |  |
Independent Directors | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award life | 7 years |  |  |
Vesting period | 1 year |  |  | 3 years
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 Discount rate from fair value on offering date that participants pay for shares. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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