Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 729,800	$ 681,960	$ 1,445,343	$ 1,364,721
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 234,045	$ 208,012	$ 452,883	$ 406,784
Fee revenue, percentage	32.40%	30.90%	31.70%	30.10%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 135,915	$ 126,110	$ 272,354	$ 251,247
Fee revenue, percentage	18.80%	18.70%	19.00%	18.60%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 119,114	$ 112,598	$ 236,558	$ 231,588
Fee revenue, percentage	16.50%	16.70%	16.50%	17.20%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 104,473	$ 96,017	$ 209,805	$ 193,937
Fee revenue, percentage	14.50%	14.20%	14.70%	14.40%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 84,953	$ 88,498	$ 169,334	$ 173,645
Fee revenue, percentage	11.80%	13.10%	11.80%	12.90%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 43,199	$ 43,130	$ 89,378	$ 92,110
Fee revenue, percentage	6.00%	6.40%	6.30%	6.80%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 721,699	$ 674,365	$ 1,430,312	$ 1,349,311
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%