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Disclosure of Compensation Related Costs, Share Based Payments (Details) - 2009 Stock Incentive Plan - USD ($) | 3 Months Ended |
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Jul. 31, 2019 | Jul. 31, 2018 | Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of shares available for grant (in shares) | 2,647,608 |  |
Allocated share-based compensation expense | $ 7,542,000 | $ 10,154,000 |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of options outstanding (in shares) | 58,896 |  | 109,827
Aggregate intrinsic value for outstanding options | $ 6,921,000 |  |
Weighted average remaining contractual life (in years) | 1 year 11 months 1 day |  |
Aggregate intrinsic value for exercised options | $ 5,518,000 |  |
Unrecognized compensation costs related to plan | 0 |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Unrecognized compensation costs related to plan | $ 20,970,000 |  |
Return on invested capital measurement period | 3 years |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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