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Stock-Based Compensation, Performance-Based and Other Restricted Stock Activity (Details) - $ / shares shares in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Restricted Stock [Member]
Restricted Stock [Abstract]
Awards granted (in shares)	433	358
Weighted average fair value of grant (in dollars per share)	$ 57.36	$ 38.88
Performance-based Stock Awards [Member]
Restricted Stock [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.

+ References

No definition available.

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- References

No definition available.

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- Definition

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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- Definition

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).

+ 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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