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Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018
Deferred Compensation and Pension Plan |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Tax effect on reclassifications of realized net losses | $ 0.2 | $ 0.1
Unrealized (Losses) Gains on Interest Rate Swap |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Tax effect on unrealized gains (losses) | $ (0.2) | $ 0.1

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