Organization and Summary of Significant Accounting Policies - Compensation and Benefits Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Organization And Summary Of Significant Accounting Policies [Line Items]
Performance-related bonus expenses	$ 390.0	$ 409.4	$ 447.6
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Amortization of long-term retention awards	4 years
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Amortization of long-term retention awards	5 years