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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 |  |

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