Net Income Per Common Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Basic
Net income	$ 446,691	$ 339,790	$ 312,900
Weighted average shares outstanding-basic (shares)	37,266,851	37,158,898	37,092,273
Basic earnings per common share (in Dollars per share)	$ 11.99	$ 9.14	$ 8.44
Diluted
Net income	$ 446,691	$ 339,790	$ 312,900
Weighted average shares outstanding-basic (shares)	37,266,851	37,158,898	37,092,273
Plus effect of stock options and restricted stock units (shares)	252,844	197,800	263,865
Weighted-average shares outstanding-diluted (shares)	37,519,695	37,356,698	37,356,138
Diluted earnings per common share (in Dollars per share)	$ 11.91	$ 9.10	$ 8.38