Restructuring (Provision of Charges and Liability) (Details) (Employee Severance, USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Dec. 28, 2014	Mar. 30, 2014
Restructuring Reserve
Balance as of March 30, 2014			$ 638	$ 638
Provision				19,677
Payments				(4,368)
Balance as of December 28, 2014	15,947			15,947
Other Restructuring Plan
Restructuring Reserve
Balance as of March 30, 2014			638	638
Provision	300	300	400	972	5,500
Payments				(1,270)
Balance as of December 28, 2014	340			340	638
High-Speed Converter Business
Restructuring Reserve
Balance as of March 30, 2014			0	0
Provision	11,900	6,800		18,705
Payments				(3,098)
Balance as of December 28, 2014	$ 15,607			$ 15,607