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Stock-Based Compensation, Performance-Based and Other Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Restricted Stock, Additional Disclosures [Abstract]
Stock-based compensation expense	$ 21,982	$ 20,009	$ 18,327
Restricted Stock Awards [Member]
Restricted Shares [Roll Forward]
Nonvested shares at beginning of year (in shares)	943	756	861
Granted (in shares)	706	759	415
Change in shares due to performance (in shares)		(70)	(19)
Change in shares due to performance (in shares)	118
Vested and issued (in shares)	(362)	(329)	(357)
Forfeited (in shares)	(125)	(173)	(144)
Nonvested shares at end of year (in shares)	1,280	943	756	861
Weighted Average Grant Date Value [Abstract]
Nonvested shares at beginning of year (in dollars per share)	$ 49.74
Granted (in dollars per share)	41.49
Change in shares due to performance (in dollars per share)	49.84
Vested and issued (in dollars per share)	48.48
Forfeited (in dollars per share)	47.88
Nonvested shares at end of year (in dollars per share)	$ 45.73	$ 49.74
Restricted Stock, Additional Disclosures [Abstract]
Unrecognized share-based compensation expense	$ 36,300
Award vesting period	4 years
Weighted average recognition period for unrecognized share-based compensation	2 years 2 months 12 days
Total grant date fair value of restricted shares vested	$ 17,600	$ 17,500	$ 19,600
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on Fourth Anniversary Date Following Date of Grant [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage							50.00%
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on Fifth Anniversary Date Following Date of Grant [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage							50.00%
Restricted Stock Awards [Member] | Key Employees [Member] | Annual Vesting on Anniversary of Grant [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage						25.00%
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on June 30th of Year Following Performance Cycle [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage		100.00%	100.00%	100.00%
Performance-based Restricted Stock Awards [Member]
Stock-Based Compensation [Abstract]
Period for achievement of performance-based targets	3 years
Performance-based Restricted Stock Awards [Member] | Vesting on First Anniversary Date after Award Is Earned [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage							50.00%
Performance-based Restricted Stock Awards [Member] | Vesting on Second Anniversary Date after Award Is Earned [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage							50.00%
Performance-based Restricted Stock Awards [Member] | Vesting at End of Performance Cycle [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage					50.00%	50.00%
Performance-based Restricted Stock Awards [Member] | Vesting on April 30th of Year Following Performance Cycle [Member]
Stock-Based Compensation [Abstract]
Award vesting percentage					50.00%	50.00%

X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards that changed due to performance 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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The number of equity-based payment instruments, excluding stock options, that decreased due to performance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Percentage of vesting of award under share-based payment arrangement.

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