Restructuring (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 27, 2015 USD ($) employee	Jun. 28, 2015 USD ($) employee	Sep. 28, 2014 USD ($)	Sep. 27, 2015 USD ($)	Sep. 28, 2014 USD ($)	Mar. 29, 2015 USD ($) employee Employee
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				$ 2,902
Restructuring Reserve	$ 4,191			4,191		$ 10,512
High-Speed Converter Business | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				0		$ 18,300
Number of positions eliminated (employees) | Employee						53
Restructuring Reserve	2,223			2,223		$ 10,217
Other Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				2,902
Restructuring Reserve	1,968			1,968		295
Other Restructuring Plan - 2016 Charge | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 2,000	$ 900		900
Number of positions eliminated (employees) | employee	24	11
Restructuring Reserve	$ 2,000			2,000
High-Speed Converter Business
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0		$ 6,775	$ 0	$ 6,775
High-Speed Converter Business | Other Restructuring Plan - 2015 Charge
Restructuring Cost and Reserve [Line Items]
Restructuring Charges						$ 1,100
Number of positions eliminated (employees) | employee						28
Restructuring and Related Cost, Incurred Cost		$ 300				$ 800