Business Combinations - Additional Information (Details) $ in Thousands	3 Months Ended
	Jan. 31, 2021 USD ($) acquisitions	Oct. 31, 2020 USD ($)
Business Acquisition [Line Items]
Number of completed acquisitions | acquisitions	2
Consideration transfered	$ 77,500
Goodwill	3,433,003	$ 3,365,114
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Identifiable intangibles assets acquired	20,300
Goodwill	$ 59,300