Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]
Total contributions to the ESOP	$ 3.0	$ 2.0	$ 18.0
401(k) Plan
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]
Employee benefit plans, employer matching contribution, percent of employees' salary	3.00%
Employee benefit plans, total employer contribution	$ 10.9	$ 10.1	$ 8.5
401(k) Plan | Minimum
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]
Employee benefit plans, employer matching contribution, percent of employees' salary	3.00%
401(k) Plan | Maximum
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]
Employee benefit plans, employer matching contribution, percent of employees' salary	5.00%
401(k) Plan | Up To 3% of Employee Salary
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]
Employee benefit plans, employer matching contribution percentage	100.00%
401(k) Plan | Between 3% and 5% of Employee Salary
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]
Employee benefit plans, employer matching contribution percentage	50.00%