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Commitments And Contingencies (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010
Commitments and Contingencies [Line Items] |  |  |
Lease expiration date | 2026 |  |
Total rental expense | $ 35.5 | $ 32.4 | $ 32.8
Line of credit facility, maximum borrowing capacity | 50 |  |
Outstanding standby letters of credit | 2.9 | 2.9 |
Maximum amount to be paid to the executive officers under absence of change of control | 6.1 |  |
Maximum amount to be paid to the executive officers under change of control | 9.0 |  |
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. 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. |  |
Letters Of Credit [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 10 |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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