Organization and Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2023 USD ($)	Oct. 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Oct. 31, 2023 USD ($) segment business	Oct. 31, 2022 USD ($)	Apr. 30, 2023 USD ($)
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
Impairment of right-of-use assets		0	0	1,629,000	0
Impairment of fixed assets		1,452,000	0	1,575,000	0
Impairment of goodwill	$ 0			0		$ 0
Impairment of intangible assets				0		$ 0
Performance-related bonus expenses		$ 97,200,000	99,800,000	$ 189,300,000	201,600,000
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful lives		1 year		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		24 years
Amortization of long-term retention awards				5 years
Right-Of-Use Assets
Organization And Summary Of Significant Accounting Policies [Line Items]
Impairment of right-of-use assets				$ 1,600,000
Leasehold Improvements And Furniture And Fixtures
Organization And Summary Of Significant Accounting Policies [Line Items]
Impairment of fixed assets				100,000
Software
Organization And Summary Of Significant Accounting Policies [Line Items]
Impairment of fixed assets		$ 1,500,000	$ 0	$ 1,500,000	$ 0
Mexican Subsidiary
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of noncontrolling interest in subsidiary		51.00%		51.00%
Marquee and Regional Account Program | Revenue Benchmark | Customer Concentration Risk
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				35.00%