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Stock-Based Compensation - Performance-Based and Other Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 31, 2024	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Restricted Stock, Additional Disclosures [Abstract]
Stock-based compensation expense		$ 24,982	$ 26,504	$ 25,705
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
Award vesting percentage	100.00%
Restricted Shares
Granted (in shares)	35,538
Weighted Average Grant Date Value
Granted (in dollars per share)	$ 30.23
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%
Restricted Stock Awards
Restricted Shares
Nonvested shares at beginning of year (in shares)		1,073,000	1,274,000	1,280,000
Granted (in shares)		1,089,000	540,000	658,000
Change in shares due to performance (in shares)		54,000	(44,000)	(3,000)
Vested and issued (in shares)		(660,000)	(544,000)	(432,000)
Forfeited (in shares)		(353,000)	(153,000)	(229,000)
Nonvested shares at end of year (in shares)		1,203,000	1,073,000	1,274,000
Weighted Average Grant Date Value
Nonvested shares at beginning of year (in dollars per share)		$ 48.49
Granted (in dollars per share)		31.33
Change in shares due to performance (in dollars per share)		57.55
Vested and issued (in dollars per share)		45.29
Forfeited (in dollars per share)		41.84
Nonvested shares at end of year (in dollars per share)		$ 37.07	$ 48.49
Restricted Stock, Additional Disclosures [Abstract]
Unrecognized share-based compensation expense		$ 29,400
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		$ 29,900	$ 25,700	$ 22,000
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%

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- 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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