Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Computation of basic and diluted earnings per share of common stock
Net income	$ 89,470	$ 61,202
Basic earnings per common share:
Basic weighted average common shares outstanding (in shares)	42,549	43,089
Basic earnings per common share (in dollars per share)	$ 2.10	$ 1.42
Diluted earnings per common share:
Basic weighted average common shares outstanding (in shares)	42,549	43,089
Add: Common Stock Equivalents (in shares)	768	883
Diluted weighted average common shares outstanding (in shares)	43,317	43,972
Diluted earnings per common share (in dollars per share)	$ 2.07	$ 1.39
Shares were not included in the calculation of Diluted loss per common share
Anti-dilutive shares (in shares)	0	0