Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Computation of basic and diluted earnings per share of common stock
Net income	$ 86,830	$ 89,470
Basic earnings per common share:
Basic weighted average common shares outstanding (in shares)	40,749	42,549
Basic earnings per common share (in dollars per share)	$ 2.13	$ 2.10
Diluted earnings per common share:
Basic weighted average common shares outstanding (in shares)	40,749	42,549
Add: Common Stock Equivalents (in shares)	728	768
Diluted weighted average common shares outstanding (in shares)	41,477	43,317
Diluted earnings per common share (in dollars per share)	$ 2.09	$ 2.07
Shares were not included in the calculation of Diluted loss per common share
Anti-dilutive shares (in shares)	0	0