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Balance Sheet Accounts (Narratives) (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 14, 2017 | Sep. 30, 2017 | Oct. 26, 2016
Balance Sheet Accounts [Line Items] |  |  |
Additional goodwill related to acquisition |  | $ 38,338,000 |
Borrowings under Term Loan |  | $ 80,000,000 |
Standard hardware warranty period (in months) |  | 12 months |
Standard software warranty period (in days) |  | 90 days |
Limited lifetime hardware warranty maximum period after end of sale of product (in years) |  | 5 years |
Maximum investment in one obligor or maker (percent) |  | 10.00% |
Accounts Receivable | Jenne Corporation |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Concentration risk (percent) |  | 17.00% |
Accounts Receivable | Westcon Group Inc. |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Concentration risk (percent) |  | 15.00% |
Accounts Receivable | Tech Data Corporation |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Concentration risk (percent) |  | 13.00% |
Term Loan |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Interest rate, floor |  | 0.00% |
Term Loan | London Interbank Offered Rate (LIBOR) |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Interest rate, applicable margin |  | 3.25% |
Term Loan | Adjusted Base Rate |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Interest rate, applicable margin |  | 1.25% |
Revolving Facility |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Interest rate, floor |  | 0.00% |
Borrowings available under facility |  | $ 49,100,000 |
Outstanding letters of credit |  | $ 900,000 |
Revolving Facility | London Interbank Offered Rate (LIBOR) |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Interest rate, applicable margin |  | 3.25% |
Revolving Facility | Adjusted Base Rate |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Interest rate, applicable margin |  | 1.25% |
Avaya Networking |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Additional goodwill related to acquisition |  | $ 38,300,000 |
Borrowings under Term Loan | $ 80,000,000 |  |
Avaya Networking | Credit Facility |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Borrowing capacity from Credit Agreement |  |  | $ 140,500,000
Avaya Networking | Second Amendment | Credit Facility |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Borrowing capacity from Credit Agreement | 243,700,000 |  |
Avaya Networking | Second Amendment | Term Loan |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Borrowing capacity from Credit Agreement | $ 183,700,000 |  |
Credit Facility, as amended term | 5 years |  |
Avaya Networking | Second Amendment | Revolving Facility |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Borrowing capacity from Credit Agreement | $ 60,000,000 |  |
Credit Facility, as amended term | 5 years |  |
Developed technology | In-process research and development, with indefinite life |  |  |
Balance Sheet Accounts [Line Items] |  |  |
In-process research and development reclassified to developed technology |  | $ 1,400,000 |
Maximum |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Extended warranty period |  | 5 years |
Maximum | Revolving Facility |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Commitment fee |  | 0.50% |
Maximum | Avaya Networking | Second Amendment |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Additional incremental loan facility | $ 50,000,000 |  |
Minimum |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Extended warranty period |  | 1 year |
Minimum | Revolving Facility |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Commitment fee |  | 0.375% |
Cash equivalents | Maximum |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Maturity period for investments |  | 3 months |
Short-term investments | Maximum |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Maturity period for investments |  | 1 year |
Short-term investments | Minimum |  |  |
Balance Sheet Accounts [Line Items] |  |  |
Maturity period for investments |  | 3 months |

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