Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2026	Jan. 31, 2025
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 725,042	$ 676,538	$ 2,170,385	$ 2,041,259
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 226,085	$ 198,830	$ 678,968	$ 605,614
Fee revenue, percentage	31.50%	29.70%	31.60%	30.00%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 135,951	$ 126,378	$ 408,305	$ 377,625
Fee revenue, percentage	19.00%	18.90%	19.00%	18.70%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 121,526	$ 118,358	$ 358,084	$ 349,946
Fee revenue, percentage	16.90%	17.70%	16.70%	17.30%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 103,839	$ 98,425	$ 313,644	$ 292,362
Fee revenue, percentage	14.40%	14.70%	14.60%	14.50%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 88,657	$ 83,977	$ 257,991	$ 257,622
Fee revenue, percentage	12.40%	12.60%	12.00%	12.80%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 41,327	$ 42,761	$ 130,705	$ 134,871
Fee revenue, percentage	5.80%	6.40%	6.10%	6.70%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 717,385	$ 668,729	$ 2,147,697	$ 2,018,040
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%