Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 686,845	$ 684,956	$ 2,125,712	$ 1,916,452
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 199,341	$ 181,016	$ 601,698	$ 500,078
Fee revenue, percentage	29.30%	26.60%	28.60%	26.20%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 125,064	$ 126,840	$ 391,863	$ 370,009
Fee revenue, percentage	18.40%	18.60%	18.60%	19.40%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 117,880	$ 121,459	$ 367,878	$ 341,099
Fee revenue, percentage	17.30%	17.80%	17.50%	17.90%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 112,218	$ 124,903	$ 359,475	$ 323,504
Fee revenue, percentage	16.50%	18.40%	17.10%	17.00%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 88,631	$ 97,210	$ 283,859	$ 271,233
Fee revenue, percentage	13.00%	14.30%	13.50%	14.20%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 37,648	$ 29,313	$ 99,761	$ 99,656
Fee revenue, percentage	5.50%	4.30%	4.70%	5.30%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 680,782	$ 680,741	$ 2,104,534	$ 1,905,579
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%