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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - Deferred Compensation and Pension Plan - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Tax effect on unrealized gains (losses) | $ 0.3 |  | $ 0.3 |
Tax effect on reclassification of realized net losses | $ 0.1 | $ 0.2 | $ 0.3 | $ 0.7

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