Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	COMMON STOCK	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE LOSS
Balance at beginning of period (shares) at Apr. 30, 2023		16,635,295
Balance at beginning of period at Apr. 30, 2023	$ 873,788	$ 370,259	$ 493,157	$ 10,372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	37,850		37,850
Other comprehensive loss, net of tax	914			914
Stock-based compensation	2,247	$ 2,247
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares)		55,092
Exercise of stock-based compensation awards, net of amounts withheld for taxes	(1,830)	$ (1,830)
Stock repurchases (shares)		(328,295)
Stock repurchases	(22,280)	$ (6,565)	(15,715)
Employee benefit plan contributions (shares)		50,786
Employee benefit plan contributions	3,676	$ 3,676
Balance at end of period (shares) at Jul. 31, 2023		16,412,878
Balance at end of period at Jul. 31, 2023	894,365	$ 367,787	515,292	11,286
Balance at beginning of period (shares) at Apr. 30, 2023		16,635,295
Balance at beginning of period at Apr. 30, 2023	873,788	$ 370,259	493,157	10,372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	68,191
Balance at end of period (shares) at Oct. 31, 2023		16,026,398
Balance at end of period at Oct. 31, 2023	895,580	$ 362,057	523,223	10,300
Balance at beginning of period (shares) at Jul. 31, 2023		16,412,878
Balance at beginning of period at Jul. 31, 2023	894,365	$ 367,787	515,292	11,286
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,341		30,341
Other comprehensive loss, net of tax	(986)			(986)
Stock-based compensation	2,155	$ 2,155
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares)		7,740
Exercise of stock-based compensation awards, net of amounts withheld for taxes	0	$ 0
Stock repurchases	(30,295)
Stock repurchases (shares)		(394,220)
Stock repurchases		$ (7,885)	(22,410)
Balance at end of period (shares) at Oct. 31, 2023		16,026,398
Balance at end of period at Oct. 31, 2023	$ 895,580	$ 362,057	523,223	10,300
Balance at beginning of period (shares) at Apr. 30, 2024	15,653,463	15,653,463
Balance at beginning of period at Apr. 30, 2024	$ 910,376	$ 359,784	543,274	7,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,633		29,633
Other comprehensive loss, net of tax	(2,142)			(2,142)
Stock-based compensation	2,941	$ 2,941
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares)		46,959
Exercise of stock-based compensation awards, net of amounts withheld for taxes	(2,730)	$ (2,730)
Stock repurchases (shares)		(271,460)
Stock repurchases	(24,239)	$ (5,525)	(18,714)
Balance at end of period (shares) at Jul. 31, 2024		15,428,962
Balance at end of period at Jul. 31, 2024	$ 913,839	$ 354,470	554,193	5,176
Balance at beginning of period (shares) at Apr. 30, 2024	15,653,463	15,653,463
Balance at beginning of period at Apr. 30, 2024	$ 910,376	$ 359,784	543,274	7,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 57,319
Balance at end of period (shares) at Oct. 31, 2024	15,161,275	15,161,275
Balance at end of period at Oct. 31, 2024	$ 915,062	$ 355,377	556,412	3,273
Balance at beginning of period (shares) at Jul. 31, 2024		15,428,962
Balance at beginning of period at Jul. 31, 2024	913,839	$ 354,470	554,193	5,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,686		27,686
Other comprehensive loss, net of tax	(1,903)			(1,903)
Stock-based compensation	2,864	$ 2,864
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares)		28,840
Exercise of stock-based compensation awards, net of amounts withheld for taxes	0	$ 0
Stock repurchases (shares)		(348,877)
Stock repurchases	(32,699)	$ (7,232)	(25,467)
Employee benefit plan contributions (shares)		52,350
Employee benefit plan contributions	$ 5,275	$ 5,275
Balance at end of period (shares) at Oct. 31, 2024	15,161,275	15,161,275
Balance at end of period at Oct. 31, 2024	$ 915,062	$ 355,377	$ 556,412	$ 3,273