Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance, Shares at Apr. 30, 2022		16,570,619
Beginning Balance at Apr. 30, 2022	$ 772,883	$ 363,224	$ 399,434	$ 10,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	93,723		93,723
Other comprehensive income (loss), net of tax	147			147
Stock-based compensation	7,396	$ 7,396
Exercise of stock-based compensation awards, net of amounts withheld for taxes, shares		47,576
Exercise of stock-based compensation awards, net of amounts withheld for taxes	(1,199)	$ (1,199)
Employee benefit plan contributions, shares		17,100
Employee benefit plan contributions	838	$ 838
Ending Balance, Shares at Apr. 30, 2023		16,635,295
Ending Balance at Apr. 30, 2023	873,788	$ 370,259	493,157	10,372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	116,216		116,216
Other comprehensive income (loss), net of tax	(3,054)			(3,054)
Stock-based compensation	$ 10,682	$ 10,682
Exercise of stock-based compensation awards, net of amounts withheld for taxes, shares	0	76,097
Exercise of stock-based compensation awards, net of amounts withheld for taxes	$ (2,492)	$ (2,492)
Stock repurchases, shares		(1,108,715)
Stock repurchases	(88,440)	$ (22,341)	(66,099)
Employee benefit plan contributions, shares		50,786
Employee benefit plan contributions	$ 3,676	$ 3,676
Ending Balance, Shares at Apr. 30, 2024	15,653,463	15,653,463
Ending Balance at Apr. 30, 2024	$ 910,376	$ 359,784	543,274	7,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	99,456		99,456
Other comprehensive income (loss), net of tax	(6,763)			(6,763)
Stock-based compensation	$ 7,989	$ 7,989
Exercise of stock-based compensation awards, net of amounts withheld for taxes, shares	0	76,603
Exercise of stock-based compensation awards, net of amounts withheld for taxes	$ (2,765)	$ (2,765)
Stock repurchases, shares		(1,169,710)
Stock repurchases	(97,570)	$ (23,830)	(73,740)
Employee benefit plan contributions, shares		52,350
Employee benefit plan contributions	$ 5,275	$ 5,275
Ending Balance, Shares at Apr. 30, 2025	14,612,706	14,612,706
Ending Balance at Apr. 30, 2025	$ 915,998	$ 346,453	$ 568,990	$ 555