Commitments and Contingencies - Additional Information (Detail)			1 Months Ended	3 Months Ended
		Oct. 24, 2017 USD ($)	Oct. 30, 2011 Patents	Sep. 29, 2017 USD ($)
Other Commitments [Line Items]
Non-cancelable purchase commitments				$ 27,800,000
Maximum amount of potential future payments under the company's financial guarantees				800,000
Estimated Litigation Liability, Current	[1]			2,500,000
Guarantee Obligations [Member]
Other Commitments [Line Items]
Guarantees related to rent obligations				1,900,000
Indemnification [Member]
Other Commitments [Line Items]
Accrual for indemnification provisions				0
Israel [Member] | Guarantee Obligations [Member]
Other Commitments [Line Items]
Guarantees related to rent obligations				300,000
TVN [Member] | Guarantee Obligations [Member]
Other Commitments [Line Items]
Guarantees related to rent obligations				1,300,000
Avid [Member]
Other Commitments [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number | Patents			2
Estimated Litigation Liability				6,000,000
Estimated Litigation Liability, Current				2,500,000
Estimated Litigation Liability, Noncurrent				3,500,000
Avid [Member] | Subsequent Event [Member]
Other Commitments [Line Items]
Payments for Legal Settlements		$ 2,500,000
Avid [Member] | Selling, General and Administrative Expenses [Member]
Other Commitments [Line Items]
Litigation Settlement, Expense				6,000,000
Settled Litigation Payment Second Quarter of 2019 [Member] | Avid [Member]
Other Commitments [Line Items]
Estimated Litigation Liability, Noncurrent				1,500,000
Settled Litigation Payment Third Quarter of 2020 [Member] | Avid [Member]
Other Commitments [Line Items]
Estimated Litigation Liability, Noncurrent				$ 2,000,000

[1] See Note 18, “Commitments and Contingencies-Legal Proceedings,” for additional information on the Company’s accrual for the Avid litigation settlement.