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Employer Sponsored Benefit Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Apr. 30, 2018 USD ($) InvestmentPlan | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Contributory Defined Investment Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of contributory defined investment plan | InvestmentPlan | 2 |  |
Defined contribution plan, employee contribution percentage | 100.00% |  |
Defined contribution plan, matching contribution percentage | 6.00% |  |
Deferred compensation plan description | We offer two contributory defined investment plans covering substantially all employees, subject to service requirements. Employees may contribute up to 100% of their annual pay, depending on the plan. We generally make discretionary matching contributions of up to 50% of the first 6% of employee contributions to the plan. |  |
Employer contribution to defined benefit plan | $ 3.0 | $ 2.7 | $ 2.4
Contributory Defined Investment Plan | Maximum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, matching contribution percentage of match | 50.00% |  |
Non-Contributory Profit Sharing Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan service period | 1 year |  |
Employer contribution to defined benefit plan |  | $ 13.0 | $ 11.5
Defined contribution plan expected contribution | $ 1.3 |  |

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- Definition Defined contributions plan contributions by employer. + References No definition available. + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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