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Deferred Compensation and Retirement Plans - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Apr. 30, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gross CSV | $ 160,900,000 |  | $ 159,200,000
Outstanding policy loans | 73,300,000 |  | 73,300,000
Increase in market value of the underlying COLI investments | 1,291,000 | 671,000 |
Executive Capital Accumulation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's contributions | 14,200,000 | 17,500,000 |
Deferred compensation arrangement vesting terms | Participants generally vest in Company contributions over a four year period. |  |
Deferred compensation arrangement, expected company contribution in remainder of fiscal year | 2,500,000 |  |
Increase (decrease) in compensation expense | $ 1,600,000 | $ (1,000,000) |

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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