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Commitments And Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Commitments and Contingencies [Line Items] |  |  |
Lease expiration date | 2026 |  |
Total rental expense | $ 39,600,000 | $ 38,400,000 | $ 35,500,000
Maximum amount to be paid to the executive officers under absence of change of control | 11,500,000 |  |
Maximum amount to be paid to the executive officers under change of control | 14,600,000 |  |
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. In addition, the Company has a severance policy for all of its vice presidents that provides for minimum payments based on length of service. Upon termination without cause, the Company is required to pay the greater of the amount due under the employment agreement, if any, or the severance policy. 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 both during the term of their employment, and for a period of up to two years after their employment ends. For a period of two years after their employment with the Company, former vice presidents are prohibited from soliciting employees of the Company for employment outside of the Company. |  |
Compensation and benefit expense | 646,889,000 | 555,346,000 | 534,186,000
Employment dispute |  |  |
Commitments and Contingencies [Line Items] |  |  |
Compensation and benefit expense | 4,500,000 |  |
Compensation outstanding liability | $ 0 |  |

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- Definition The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + 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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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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