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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Stock-based Compensation [Abstract]
Share-based compensation expense	$ 5,600	$ 5,400	$ 14,744	$ 15,662
Restricted Stock [Member]
Restricted Stock [Abstract]
Awards granted (in shares)			691	738
Weighted average fair value of grant (in dollars per share)			$ 41.26	$ 44.85
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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Amount of noncash expense for share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The weighted average fair value at grant date for nonvested equity-based awards issued 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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