Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Oct. 31, 2018	Oct. 01, 2018	Jul. 02, 2018
Business Acquisition [Line Items]
Goodwill	$ 297,937	$ 297,968
DonRiver
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,025
Accounts receivable			4,790
Prepaid expenses and other long term assets			372
Goodwill			10,453
Deferred revenue			(193)
Other current and long term liabilities			(9,664)
Total purchase price			54,183
DonRiver | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets acquired			37,700
DonRiver | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired			$ 9,700
Packet Design
Business Acquisition [Line Items]
Cash and cash equivalents				$ 642
Accounts receivable				1,525
Prepaid expenses and other long term assets				450
Equipment, furniture and fixtures				31
Goodwill				20,304
Accounts payable				(165)
Accrued liabilities				(657)
Deferred revenue				(5,176)
Total purchase price				41,054
Packet Design | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets acquired				2,200
Packet Design | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired				$ 21,900