Acquisitions - Proforma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Business Combinations [Abstract]
Total revenue	$ 3,262,942	$ 2,456,322	$ 6,502,640	$ 4,788,888
Net income	$ 98,378	$ 114,439	$ 225,741	$ 234,694
Net income per common share
Basic (in dollars per share)	$ 2.65	$ 3.09	$ 6.08	$ 6.34
Diluted (in dollars per share)	$ 2.63	$ 3.07	$ 6.04	$ 6.30