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Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Jul. 31, 2021 | Jul. 31, 2020
Deferred Compensation and Pension Plan |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Tax effect on reclassification of realized net losses | $ 0.1 | $ 0.2

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- Definition Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569616-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580 + Details
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