Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Nov. 02, 2019	Oct. 01, 2018	Jul. 02, 2018
Business Acquisition [Line Items]
Goodwill	$ 310,847	$ 297,937
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
Centina Systems, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents		5,718
Accounts receivable		610
Prepaid expenses and other long-term assets		536
Equipment, furniture and fixtures		17
Goodwill		13,055
Accounts payable		(47)
Accrued liabilities		(286)
Deferred revenue		(1,493)
Deferred tax liability		(6,692)
Total purchase price		34,018
Centina Systems, Inc. | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets acquired		400
Centina Systems, Inc. | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired		$ 22,200