Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings
Beginning Balance (shares) at Apr. 30, 2021		36,949,878
Beginning Balance at Apr. 30, 2021	$ 1,932,679	$ 58,951	$ 1,873,728
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	339,790		339,790
Dividends declared	(52,092)		(52,092)
Exercise of stock options (shares)		3,000
Exercise of stock options	133	$ 133
Stock-based compensation (shares)		158,789
Share-based compensation (net of tax withholding on employee share-based awards)	20,328	$ 20,328
Ending Balance (shares) at Apr. 30, 2022		37,111,667
Ending Balance at Apr. 30, 2022	2,240,838	$ 79,412	2,161,426
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	446,691		446,691
Dividends declared	(57,488)		(57,488)
Stock-based compensation (shares)		151,581
Share-based compensation (net of tax withholding on employee share-based awards)	$ 30,625	$ 30,625
Ending Balance (shares) at Apr. 30, 2023	37,263,248	37,263,248
Ending Balance at Apr. 30, 2023	$ 2,660,666	$ 110,037	2,550,629
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	501,972
Dividends declared	$ (64,673)		(64,673)
Repurchase of common stock (shares)	(392,290)
Repurchase of common stock	$ (105,451)
Stock-based compensation (shares)		137,530
Share-based compensation (net of tax withholding on employee share-based awards)	$ 22,867	$ 22,867
Ending Balance (shares) at Apr. 30, 2024	37,008,488	37,008,488
Ending Balance at Apr. 30, 2024	$ 3,015,381	$ 27,453	$ 2,987,928