Restructuring (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($)	Jan. 03, 2016 USD ($) employee	Jun. 28, 2015 USD ($)	Dec. 28, 2014 USD ($)	Jan. 03, 2016 USD ($) employee	Dec. 28, 2014 USD ($)	Mar. 29, 2015 USD ($) employee
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 8,910
Payments for restructuring actions					10,854
Accrued balance for employee severance costs		$ 8,568			8,568		$ 10,512
Zentrum Mikroelektronik Dresden AG | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,500				8,910
Payments for restructuring actions					2,290
Accrued balance for employee severance costs		6,915			6,915		295
High-Speed Converter Business | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0		$ 18,300
Number of positions eliminated (employees) | employee							53
Payments for restructuring actions					8,564
Accrued balance for employee severance costs		1,653			1,653		$ 10,217
Other Restructuring Plan - 2016 Charge | Employee Severance
Restructuring Cost and Reserve [Line Items]
Payments for restructuring actions					2,300
Accrued balance for employee severance costs		2,400			2,400
Other Restructuring Plan - 2015 Charge | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1,500			$ 4,400		$ 1,100
Number of positions eliminated (employees) | employee		2			37		28
Payments for restructuring actions			$ 300				$ 800
High-Speed Converter Business
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 11,930	$ 0	$ 18,705