Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 712,447	$ 735,719	$ 1,418,709	$ 1,438,867
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 204,931	$ 206,448	$ 406,849	$ 402,357
Fee revenue, percentage	29.10%	28.40%	29.00%	28.30%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 123,865	$ 133,595	$ 243,219	$ 266,799
Fee revenue, percentage	17.60%	18.40%	17.30%	18.70%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 122,048	$ 131,199	$ 250,372	$ 249,998
Fee revenue, percentage	17.30%	18.00%	17.90%	17.50%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 98,129	$ 124,605	$ 213,902	$ 247,257
Fee revenue, percentage	13.90%	17.10%	15.20%	17.40%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 96,996	$ 99,280	$ 193,423	$ 195,228
Fee revenue, percentage	13.80%	13.60%	13.80%	13.70%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 58,034	$ 32,722	$ 95,427	$ 62,113
Fee revenue, percentage	8.30%	4.50%	6.80%	4.40%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 704,003	$ 727,849	$ 1,403,192	$ 1,423,752
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%