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Preferred and Common Stock (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 14 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2018 | Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Shares issued of preferred stock (shares) | 0 | 0 | 0 |  | 0 |
Options outstanding (shares) | 181,673 | 181,673 |  |  | 181,673 |
Aggregate intrinsic value of outstanding options | $ 10,376,000 | $ 10,376,000 |  |  | $ 10,376,000 |
Aggregate intrinsic value of exercised options |  | $ 3,144,000 |  |  |  |
Exercise price range floor (in Dollars per share) |  | $ 25.26 |  |  |  |
Exercise price range ceiling (in Dollars per share) |  | $ 44.39 |  |  |  |
Repurchase of common stock |  | $ 215,434,000 | $ 49,374,000 |  |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Reduction in available shares per stock option issued (shares) | 1 | 1 |  |  | 1 |
Options outstanding (shares) | 181,673 | 181,673 | 222,050 | 291,200 | 181,673 | 401,800
Weighted average remaining contractual life (years) |  | 2 years 7 months 24 days |  |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Reduction in available shares per restricted stock or restricted stock unit issued (shares) | 2 | 2 |  |  | 2 |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Reduction in available shares per restricted stock or restricted stock unit issued (shares) | 2 | 2 |  |  | 2 |
Stock Options, Restricted Stock and Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Share-based compensation expense |  | $ 17,880,000 | $ 10,697,000 | $ 7,413,000 |  |
2009 Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Shares available for grant under the Plan (shares) | 2,984,804 | 2,984,804 |  |  | 2,984,804 |
Unrecognized compensation costs | $ 9,058,000 | $ 9,058,000 |  |  | $ 9,058,000 |
2017 Stock Repurchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Share repurchase program authorized amount |  |  | $ 300,000,000 |  |  |
Share repurchase program period in force |  | 2 years |  |  |  |
Common stock shares repurchased (shares) |  |  |  |  | 2,441,600 |
Repurchase of common stock |  |  |  |  | $ 264,800,000 |
Remaining authorized repurchase amount | 35,200,000 | $ 35,200,000 |  |  | 35,200,000 |
2018 Stock Repurchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Share repurchase program authorized amount | 300,000,000 | $ 300,000,000 |  |  | $ 300,000,000 |
Repurchase of common stock | $ 0 |  |  |  |  |
Preferred Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Authorized shares of preferred stock (shares) | 1,000,000 | 1,000,000 |  |  | 1,000,000 |
Shares issued of preferred stock (shares) | 0 | 0 |  |  | 0 |
Series A Preferred Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Authorized shares of preferred stock (shares) | 250,000 | 250,000 |  |  | 250,000 |
Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Authorized shares of common stock (shares) | 120,000,000 | 120,000,000 |  |  | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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