Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 715,543	$ 682,761
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 218,838	$ 198,772
Fee revenue, percentage	30.90%	29.50%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 136,439	$ 125,137
Fee revenue, percentage	19.20%	18.50%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 117,444	$ 118,990
Fee revenue, percentage	16.60%	17.60%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 105,332	$ 97,920
Fee revenue, percentage	14.90%	14.50%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 84,381	$ 85,147
Fee revenue, percentage	11.90%	12.60%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 46,179	$ 48,980
Fee revenue, percentage	6.50%	7.30%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 708,613	$ 674,946
Fee revenue, percentage	100.00%	100.00%