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Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 735,719	$ 643,398	$ 1,438,867	$ 1,231,496
Industrial
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 206,448	$ 169,706	$ 402,357	$ 319,062
Fee revenue, percentage	28.40%	26.50%	28.30%	26.10%
Life Sciences/Healthcare
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 133,595	$ 127,979	$ 266,799	$ 243,169
Fee revenue, percentage	18.40%	20.00%	18.70%	19.90%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 131,199	$ 113,991	$ 249,998	$ 219,640
Fee revenue, percentage	18.00%	17.80%	17.50%	17.90%
Technology
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 124,605	$ 103,667	$ 247,257	$ 198,601
Fee revenue, percentage	17.10%	16.20%	17.40%	16.20%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 99,280	$ 92,459	$ 195,228	$ 174,023
Fee revenue, percentage	13.60%	14.50%	13.70%	14.20%
Education/Non–Profit/General
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 32,722	$ 31,641	$ 62,113	$ 70,343
Fee revenue, percentage	4.50%	5.00%	4.40%	5.70%
Fee revenue
Disaggregation Of Revenue [Line Items]
Fee revenue	$ 727,849	$ 639,443	$ 1,423,752	$ 1,224,838
Fee revenue, percentage	100.00%	100.00%	100.00%	100.00%

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