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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Deferred Compensation and Pension Plan |  |  |
Accumulated Other Comprehensive (Loss) Income [Line Items] |  |  |
Tax effect on unrealized (losses) gains | $ (2.3) | $ 2.5 | $ 1.9
Tax effect on reclassifications of realized net gains (losses) | (0.4) | (0.8) | (1.2)
Unrealized (Losses) Gains on Interest Rate Swap |  |  |
Accumulated Other Comprehensive (Loss) Income [Line Items] |  |  |
Tax effect on unrealized (losses) gains | (0.3) | 0.8 | $ (0.4)
Tax effect on reclassifications of realized net gains (losses) | $ 0.1 | $ (0.3) |

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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: 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=114867106&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: 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=114867106&loc=d3e640-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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