Employee Benefit Plans - (Other Retirement Plans) - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2020 USD ($)	Oct. 31, 2020 CAD ($)	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)
Other Retirement Plans [Line Items]
Deferred percentage of annual cash base compensation	50.00%	50.00%
Deferred percentage of variable cash compensation	100.00%	100.00%
Other Retirement Plans
Other Retirement Plans [Line Items]
Employer contribution	$ 54,700,000		$ 50,700,000	$ 56,500,000
Maximum pretax annual company contribution match per employee	$ 3,000	$ 4,000