Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings
Beginning Balance (shares) at Apr. 30, 2023		37,263,248
Beginning Balance at Apr. 30, 2023	$ 2,660,666	$ 110,037	$ 2,550,629
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	169,237		169,237
Dividends declared	(16,214)		(16,214)
Repurchase of common stock		(123,569)
Repurchase of common stock	(29,893)	$ (29,893)
Share-based compensation (net of tax withholding on employee share-based awards) (shares)		126,774
Share-based compensation (net of tax withholding on employee share-based awards)	(7,501)	$ (7,501)
Ending Balance (shares) at Jul. 31, 2023		37,266,453
Ending Balance at Jul. 31, 2023	2,776,295	$ 72,643	2,703,652
Beginning Balance (shares) at Apr. 30, 2023		37,263,248
Beginning Balance at Apr. 30, 2023	2,660,666	$ 110,037	2,550,629
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	414,952
Ending Balance (shares) at Jan. 31, 2024		37,057,224
Ending Balance at Jan. 31, 2024	2,947,461	$ 30,386	2,917,075
Beginning Balance (shares) at Jul. 31, 2023		37,266,453
Beginning Balance at Jul. 31, 2023	2,776,295	$ 72,643	2,703,652
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	158,782		158,782
Dividends declared	(16,160)		(16,160)
Repurchase of common stock		(110,481)
Repurchase of common stock	(30,391)	$ (30,391)
Share-based compensation (net of tax withholding on employee share-based awards) (shares)		8,223
Share-based compensation (net of tax withholding on employee share-based awards)	8,865	$ 8,865
Ending Balance (shares) at Oct. 31, 2023		37,164,195
Ending Balance at Oct. 31, 2023	2,897,391	$ 51,117	2,846,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	86,933		86,933
Dividends declared	(16,132)		(16,132)
Repurchase of common stock		(108,127)
Repurchase of common stock	(30,419)	$ (30,419)
Share-based compensation (net of tax withholding on employee share-based awards) (shares)		1,156
Share-based compensation (net of tax withholding on employee share-based awards)	9,688	$ 9,688
Ending Balance (shares) at Jan. 31, 2024		37,057,224
Ending Balance at Jan. 31, 2024	2,947,461	$ 30,386	2,917,075
Beginning Balance (shares) at Apr. 30, 2024		37,008,488
Beginning Balance at Apr. 30, 2024	3,015,381	$ 27,453	2,987,928
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	180,198		180,198
Dividends declared	(18,763)		(18,763)
Share-based compensation (net of tax withholding on employee share-based awards) (shares)		102,663
Share-based compensation (net of tax withholding on employee share-based awards)	(13,896)	$ (13,896)
Ending Balance (shares) at Jul. 31, 2024		37,111,151
Ending Balance at Jul. 31, 2024	3,162,920	$ 13,557	3,149,363
Beginning Balance (shares) at Apr. 30, 2024		37,008,488
Beginning Balance at Apr. 30, 2024	3,015,381	$ 27,453	2,987,928
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	448,213
Ending Balance (shares) at Jan. 31, 2025		37,118,148
Ending Balance at Jan. 31, 2025	3,417,316	$ 37,568	3,379,748
Beginning Balance (shares) at Jul. 31, 2024		37,111,151
Beginning Balance at Jul. 31, 2024	3,162,920	$ 13,557	3,149,363
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	180,918		180,918
Dividends declared	(18,823)		(18,823)
Share-based compensation (net of tax withholding on employee share-based awards) (shares)		5,830
Share-based compensation (net of tax withholding on employee share-based awards)	12,431	$ 12,431
Ending Balance (shares) at Oct. 31, 2024		37,116,981
Ending Balance at Oct. 31, 2024	3,337,446	$ 25,988	3,311,458
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	87,097		87,097
Dividends declared	(18,807)		(18,807)
Share-based compensation (net of tax withholding on employee share-based awards) (shares)		1,167
Share-based compensation (net of tax withholding on employee share-based awards)	11,580	$ 11,580
Ending Balance (shares) at Jan. 31, 2025		37,118,148
Ending Balance at Jan. 31, 2025	$ 3,417,316	$ 37,568	$ 3,379,748