Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2025	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 26,094	$ (21,409)	$ 53,536	$ 57,248	$ 56,387	$ 51,905	$ 80,957	$ 86,830	$ 115,469	$ 276,079	$ 332,991
Basic earnings per common share:
Basic weighted average common shares outstanding (in shares)	38,317	38,708	39,126	39,542	39,830	39,864	40,466	40,749	38,928	40,229	41,904
Basic earnings per common share (in dollars per share)	$ 0.68	$ (0.55)	$ 1.37	$ 1.45	$ 1.42	$ 1.30	$ 2.00	$ 2.13	$ 2.97	$ 6.86	$ 7.95
Diluted earnings per common share:
Basic weighted average common shares outstanding (in shares)	38,317	38,708	39,126	39,542	39,830	39,864	40,466	40,749	38,928	40,229	41,904
Add: Common Stock Equivalents (in shares)									575	677	688
Diluted weighted average common shares outstanding (in shares)	38,813	38,708	39,703	40,226	40,539	40,512	41,088	41,477	39,503	40,906	42,592
Diluted earnings per common share (in dollars per share)	$ 0.67	$ (0.55)	$ 1.35	$ 1.42	$ 1.39	$ 1.28	$ 1.97	$ 2.09	$ 2.92	$ 6.75	$ 7.82
Shares were not included in the calculation of Diluted loss per common share
Anti-dilutive shares (in shares)									200	200	400