Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 676,873	$ 686,845	$ 2,095,582	$ 2,125,712
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 205,187	$ 199,341	$ 612,036	$ 601,698
Fee revenue, percentage	30.70%	29.30%	29.50%	28.60%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 117,836	$ 117,880	$ 368,208	$ 367,878
Fee revenue, percentage	17.60%	17.30%	17.80%	17.50%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 115,775	$ 125,064	$ 358,994	$ 391,863
Fee revenue, percentage	17.30%	18.40%	17.30%	18.60%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 97,467	$ 88,631	$ 290,890	$ 283,859
Fee revenue, percentage	14.60%	13.00%	14.10%	13.50%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 90,784	$ 112,218	$ 304,686	$ 359,475
Fee revenue, percentage	13.60%	16.50%	14.70%	17.10%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 41,630	$ 37,648	$ 137,057	$ 99,761
Fee revenue, percentage	6.20%	5.50%	6.60%	4.70%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 668,679	$ 680,782	$ 2,071,871	$ 2,104,534
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%