Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 676,538	$ 676,873	$ 2,041,259	$ 2,095,582
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 198,830	$ 205,187	$ 605,614	$ 612,036
Fee revenue, percentage	29.70%	30.70%	30.00%	29.50%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 126,378	$ 117,836	$ 377,625	$ 368,208
Fee revenue, percentage	18.90%	17.60%	18.70%	17.80%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 118,358	$ 115,775	$ 349,946	$ 358,994
Fee revenue, percentage	17.70%	17.30%	17.30%	17.30%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 98,425	$ 90,784	$ 292,362	$ 304,686
Fee revenue, percentage	14.70%	13.60%	14.50%	14.70%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 83,977	$ 97,467	$ 257,622	$ 290,890
Fee revenue, percentage	12.60%	14.60%	12.80%	14.10%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 42,761	$ 41,630	$ 134,871	$ 137,057
Fee revenue, percentage	6.40%	6.20%	6.70%	6.60%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 668,729	$ 668,679	$ 2,018,040	$ 2,071,871
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%