Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 681,960	$ 712,447	$ 1,364,721	$ 1,418,709
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 208,012	$ 204,931	$ 406,784	$ 406,849
Fee revenue, percentage	30.90%	29.10%	30.10%	29.00%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 126,110	$ 122,048	$ 251,247	$ 250,372
Fee revenue, percentage	18.70%	17.30%	18.60%	17.90%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 112,598	$ 123,865	$ 231,588	$ 243,219
Fee revenue, percentage	16.70%	17.60%	17.20%	17.30%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 96,017	$ 98,129	$ 193,937	$ 213,902
Fee revenue, percentage	14.20%	13.90%	14.40%	15.20%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 88,498	$ 96,996	$ 173,645	$ 193,423
Fee revenue, percentage	13.10%	13.80%	12.90%	13.80%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 43,130	$ 58,034	$ 92,110	$ 95,427
Fee revenue, percentage	6.40%	8.30%	6.80%	6.80%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 674,365	$ 704,003	$ 1,349,311	$ 1,403,192
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%