Organization and Summary of Significant Accounting Policies - Additional Information (Detail)			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2023 USD ($)	Jan. 31, 2022 USD ($)	Jan. 31, 2023 USD ($)	Jan. 31, 2022 USD ($)	Jan. 31, 2023 USD ($) segment business	Jan. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of business segments | segment					8
Number of line of business | business					5
Credit loss for available for sales debt securities	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Impairment of right-of-use assets			5,471,000	0	5,471,000	7,392,000
Impairment of fixed assets			4,375,000	0	4,375,000	1,915,000
Impairment of intangible assets					0		$ 0
Impairment of goodwill	$ 0	$ 0			0		$ 0
Performance-related bonus expenses			94,100,000	$ 117,700,000	295,800,000	332,900,000
Right-Of-Use Assets
Organization And Summary Of Significant Accounting Policies [Line Items]
Impairment of right-of-use assets			5,500,000		5,500,000	7,400,000
Leasehold Improvements And Furniture And Fixtures
Organization And Summary Of Significant Accounting Policies [Line Items]
Impairment of fixed assets			$ 4,400,000		$ 4,400,000	$ 1,900,000
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful lives					1 year
Amortization of long-term retention awards					4 years
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful lives					24 years
Amortization of long-term retention awards					5 years
Mexican Subsidiary
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of noncontrolling interest in subsidiary	51.00%		51.00%		51.00%