Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 682,761	$ 706,262
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 198,772	$ 201,918
Fee revenue, percentage	29.50%	28.90%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 125,137	$ 128,324
Fee revenue, percentage	18.50%	18.30%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 118,990	$ 119,354
Fee revenue, percentage	17.60%	17.10%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 97,920	$ 115,773
Fee revenue, percentage	14.50%	16.60%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 85,147	$ 96,427
Fee revenue, percentage	12.60%	13.80%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 48,980	$ 37,393
Fee revenue, percentage	7.30%	5.30%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 674,946	$ 699,189
Fee revenue, percentage	100.00%	100.00%