Revenue - Additional Narrative (Details) - USD ($)	3 Months Ended
	Jan. 31, 2020	Oct. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized	$ 26,665,000	$ 24,606,000
Remaining performance obligation, amount	$ 638,278,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-02-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated period to satisfy a substantial portion of remaining performance obligations	24 months