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Financial Instruments - Financial Instruments and Balance Sheet Classifications (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Apr. 30, 2021
Investments Debt And Equity Securities [Abstract]
Obligations for which assets are held in trust	$ 174.6		$ 174.6		$ 157.3
Gain on marketable securities	4.8	$ 0.6	10.0	$ 12.0
Unvested obligations under deferred compensation plans	$ 26.7		$ 26.7		$ 26.5

X

- Definition

The amount of the liability included in the deferred compensation plans that is unvested and therefore the participants have not earned the right to.

+ References

No definition available.

+ Details

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X

- Definition

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

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X

- References

No definition available.

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X

- Definition

Amount of the liabilities for deferred compensation arrangements classified as other.

+ References

No definition available.

+ Details

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