Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2024	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023	Jan. 31, 2023	Oct. 31, 2022	Jul. 31, 2022	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 56,387	$ 51,905	$ 80,957	$ 86,830	$ 75,593	$ 64,775	$ 103,153	$ 89,470	$ 276,079	$ 332,991	$ 273,442
Basic earnings per common share:
Basic weighted average common shares outstanding (in shares)	39,830	39,864	40,466	40,749	41,239	41,578	42,232	42,549	40,229	41,904	43,075
Basic earnings per common share (in dollars per share)	$ 1.42	$ 1.30	$ 2.00	$ 2.13	$ 1.83	$ 1.56	$ 2.44	$ 2.10	$ 6.86	$ 7.95	$ 6.35
Diluted earnings per common share:
Basic weighted average common shares outstanding (in shares)	39,830	39,864	40,466	40,749	41,239	41,578	42,232	42,549	40,229	41,904	43,075
Add: Common Stock Equivalents (in shares)									677	688	823
Diluted weighted average common shares outstanding (in shares)	40,539	40,512	41,088	41,477	41,913	42,232	42,887	43,317	40,906	42,592	43,898
Diluted earnings per common share (in dollars per share)	$ 1.39	$ 1.28	$ 1.97	$ 2.09	$ 1.80	$ 1.53	$ 2.41	$ 2.07	$ 6.75	$ 7.82	$ 6.23
Shares were not included in the calculation of Diluted loss per common share
Anti-dilutive shares (in shares)									200	400