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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, 2023	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2017
Restricted Stock, Additional Disclosures [Abstract]
Stock-based compensation expense	$ 26,504	$ 25,705	$ 21,982
Performance-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for achievement of performance-based targets	3 years	3 years
Performance-based Restricted Stock Awards | Key Employees | Vesting on June 30 Following End of Performance Cycle
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	100.00%	100.00%	100.00%	100.00%	100.00%
Restricted Stock Awards
Restricted Shares
Nonvested shares at beginning of year (in shares)	1,274	1,280	943
Granted (in shares)	540	658	706
Change in shares due to performance (in shares)			118
Change in shares due to performance (in shares)	(44)	(3)
Vested and issued (in shares)	(544)	(432)	(362)
Forfeited (in shares)	(153)	(229)	(125)
Nonvested shares at end of year (in shares)	1,073	1,274	1,280	943
Weighted Average Grant Date Value
Nonvested shares at beginning of year (in dollars per share)	$ 49.17
Granted (in dollars per share)	45.23
Change in shares due to performance (in dollars per share)	43.29
Vested and issued (in dollars per share)	47.27
Forfeited (in dollars per share)	48.39
Nonvested shares at end of year (in dollars per share)	$ 48.49	$ 49.17
Restricted Stock, Additional Disclosures [Abstract]
Unrecognized share-based compensation expense	$ 30,700
Award vesting period	4 years
Weighted average recognition period for unrecognized share-based compensation	2 years 3 months 18 days
Grant date fair value of shares vested	$ 25,700	$ 22,000	$ 17,600
Restricted Stock Awards | Key Employees | Annual Vesting on Anniversary of Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						25.00%

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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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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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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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 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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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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