Severance, Restructuring, and Acquisition Integration Activities Severance, Restructuring and Acquisition Integration Activities - Accrued Severance (Details) - Employee Severance - Enterprise Solutions - Grass Valley And SAM Integration Program - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 3,560	$ 406	$ 0
New charges	121	10,714	456
Cash payments	(989)	(7,556)	(50)
Foreign currency translation	(9)	(4)
Other adjustments	(1,531)
Balance, end of period	$ 1,152	$ 3,560	$ 406