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Preferred and Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
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Sep. 19, 2014 | Jun. 06, 2014 | Sep. 13, 2013 | Jun. 19, 2013 | Jun. 19, 2013 | Jun. 07, 2013 | Sep. 14, 2012 | Jun. 08, 2012 | Sep. 16, 2011 | Jun. 23, 2011 | Jun. 10, 2011 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued of preferred stock |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Options outstanding |  |  |  |  |  |  |  |  |  |  |  | 401,800 |  |  |
Aggregate intrinsic value of outstanding options |  |  |  |  |  |  |  |  |  |  |  | $ 18,334 |  |  |
Aggregate intrinsic value of exercised options |  |  |  |  |  |  |  |  |  |  |  | $ 13,382 |  |  |
Number of shares vested during period |  |  |  |  |  |  |  |  |  |  |  | 441,000 |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 7,307 | $ 5,600 | $ 4,270 |
Exercise price range floor |  |  |  |  |  |  |  |  |  |  |  | $ 20.68 |  |  |
Exercise price range ceiling |  |  |  |  |  |  |  |  |  |  |  | $ 44.39 |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in available shares per restricted stock or restricted stock unit issued |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Restricted stock and restricted stock units granted in period |  |  |  |  |  |  |  |  |  |  |  | 91,000 | 91,650 | 46,998 |
Restricted Stock Units | Certain Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock and restricted stock units granted in period |  |  |  |  |  |  |  | 32,998 |  |  | 9,198 |  |  |  |
Fair value of restricted stock units granted in period |  |  |  |  |  |  |  | $ 59.48 |  |  | $ 40.49 |  |  |  |
Restricted Stock Units | Certain Officers and Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock and restricted stock units granted in period |  | 91,000 |  | 1,500 | 77,650 | 76,150 |  |  |  |  |  |  |  |  |
Fair value of awards |  | $ 6,584 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of restricted stock units granted in period |  |  |  | $ 60.47 |  | $ 62.26 |  |  |  |  |  |  |  |  |
Restricted Stock Units | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock and restricted stock units granted in period |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |
Fair value of restricted stock units granted in period |  |  |  |  |  |  |  |  |  | $ 44.39 |  |  |  |  |
Restricted Stock Units | Non-Employee Members of the Board |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock and restricted stock units granted in period |  |  | 14,000 |  |  |  | 14,000 |  | 14,000 |  |  |  |  |  |
Fair value of restricted stock units granted in period |  |  | $ 71.02 |  |  |  | $ 58.93 |  | $ 47.59 |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in available shares per restricted stock or restricted stock unit issued |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Restricted Stock | Certain Officers and Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock and restricted stock units granted in period |  | 30,538 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of awards |  | $ 2,209 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock | Non-Employee Members of the Board |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock and restricted stock units granted in period | 13,955 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of awards | $ 990 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in available shares per stock option issued |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Options outstanding |  |  |  |  |  |  |  |  |  |  |  | 401,800 | 712,024 | 854,809 | 1,053,509
Options granted in period |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Weighted average remaining contractual life (years) |  |  |  |  |  |  |  |  |  |  |  | 5 years 1 month 17 days |  |  |
Stock Options | Certain Officers and Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted in period |  |  |  |  |  |  |  |  |  | 441,000 |  |  |  |  |
2009 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant under the Plan |  |  |  |  |  |  |  |  |  |  |  | 3,894,908 |  |  |
Unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  |  | $ 5,714 |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized shares of preferred stock |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |
Shares issued of preferred stock |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized shares of preferred stock |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized shares of common stock |  |  |  |  |  |  |  |  |  |  |  | 120,000,000 |  |  |

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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=6415400&loc=d3e5070-113901 + Details
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