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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Stock-based Compensation [Abstract]
Share-based compensation expense	$ 5.7	$ 5.0	$ 10.3	$ 8.9
Restricted Stock [Member]
Restricted stock data for awards granted by the Company [Abstract]
Awards granted (in shares)			716	397
Weighted average fair value of grant (in dollars per share)	$ 44.75	$ 63.33	$ 44.75	$ 63.33
Performance-based Stock Awards [Member]
Stock-based Compensation [Abstract]
Period for achievement of performance-based targets			3 years

X

- Definition

The period of time during which certain financial performance-based targets must be achieved in order to trigger payment of performance-based restricted stock awards under the terms of the long-term incentive plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Topic 718
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-Section S99
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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