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Commitments And Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Commitments And Contingent Liabilities [Line Items] |  |  |
Lease expiration date | 2030 |  |
Total rental expense | $ 56.8 | $ 45.5 | $ 38.0
Employment agreements | The Company has a policy of entering into offer letters of employment or letters of promotion with vice presidents which provide for an annual base salary and discretionary and incentive bonus payments. Certain key vice presidents who typically have been employed by the Company for several years may also have a standard form employment agreement. Upon termination without cause, the Company is required to pay the amount of severance due under the employment agreement, if any. The Company also requires its vice presidents to agree in their employment letters and their employment agreement, if applicable, not to compete with the Company during the term of their employment, and for a certain period after their employment ends. |  |

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- Definition Commitments And Contingent Liabilities [Line Items] + References No definition available. + Details
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- Definition Employment Agreement Contracts Description + References No definition available. + Details
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- Definition The year that our last office premise lease expires. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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