Employee Benefit Plans - (Other Retirement Plans) - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2017 USD ($)	Oct. 31, 2017 CAD	Oct. 31, 2016 USD ($)	Oct. 31, 2015 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	$ 57,400,000		$ 53,400,000	$ 40,000,000
Maximum pretax annual company contribution match per employee	$ 3,000	CAD 4,000