Restructuring (Narrative) (Details) (Employee Severance, USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 28, 2014 Employee	Sep. 28, 2014 Employee	Jun. 29, 2014 Employee	Dec. 28, 2014	Mar. 30, 2014 Employee
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				$ 19,677
High-Speed Converter Business
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	11,900	6,800		18,705
Number of positions eliminated (employees)	53	53
Other Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	300	300	400	972	5,500
Number of positions eliminated (employees)	8	7	12		117
Restructuring and Related Cost, Incurred Cost					4,900
Other Restructuring Plan - 2015 Charge
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				700
Other Restructuring Plan - 2014 Charge
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				$ 600