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Commitments and Contingencies - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 24, 2017 USD ($) | Oct. 30, 2011 Patents | Dec. 31, 2017 USD ($) | Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($)
Other Commitments [Line Items] |  |  |  |  |
Non-cancelable purchase commitments |  |  |  | $ 45.1 |
Maximum amount of potential future payments under the company's financial guarantees |  |  |  | 3.3 |
Contract Manufacturing [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Bank Guarantees and Standby Letters of Credit |  |  |  | 0.8 |
Indemnification [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Accrual for indemnification provisions |  |  |  | 0.0 |
TVN [Member] | Guarantee Obligations [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Bank Guarantees and Standby Letters of Credit |  |  |  | 1.3 |
Avid [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Loss Contingency, Patents Allegedly Infringed, Number | Patents |  | 2 |  |  |
Estimated Litigation Liability |  |  |  |  | $ 6.0
Payments for litigation settlement | $ 2.5 |  |  |  |
Avid [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Litigation Settlement, Expense |  |  | $ 6.0 |  |
Settled Litigation Payment Second Quarter of 2019 [Member] | Avid [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Estimated Litigation Liability, Noncurrent |  |  |  | 1.5 |
Settled Litigation Payment Third Quarter of 2020 [Member] | Avid [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Estimated Litigation Liability, Noncurrent |  |  |  | 2.0 |
Foreign Line of Credit [Member] | Performance Guarantee [Member] | Guarantee Obligations [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | 2.0 |  |
Domestic Line of Credit [Member] | Performance Guarantee [Member] | Guarantee Obligations [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Bank Guarantees and Standby Letters of Credit |  |  | $ 2.2 |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  | $ 0.0 |

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