Business Acquisition, Intangible Assets Useful Lives (Details) - TVN [Member] $ in Thousands	3 Months Ended
	Dec. 31, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Intangibles	$ 41,100
Order or Production Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 months
Intangibles	$ 3,600
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Intangibles	$ 21,700
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Intangibles	$ 15,200
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Intangibles	$ 600