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Employer Sponsored Benefit Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Apr. 30, 2017 USD ($) InvestmentPlan | Apr. 30, 2016 USD ($) | Apr. 30, 2015 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 | $ 2.7 | $ 2.4 | $ 2.3
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 |  | $ 11.5 | $ 6.2
Defined contribution plan expected contribution | $ 13.0 |  |

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- Definition Defined contribution plan, service period. + References No definition available. + Details
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- Definition Defined contributions plan contributions by employer. + References No definition available. + Details
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- Definition Number of contributory defined investment plan. + References No definition available. + Details
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- Definition Amount of contributions made by the employer to defined benefit plans. + 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=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: 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=65897934&loc=d3e1928-114920 Reference 5: 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=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Plan -URI http://asc.fasb.org/extlink&oid=49180617 + Details
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