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Restructuring (Details) (USD $)	3 Months Ended	12 Months Ended
Restructuring (Details) (USD $)	Dec. 28, 2014	Mar. 29, 2015	Mar. 30, 2014	Mar. 31, 2013	Apr. 01, 2011
Restructuring Reserve [Roll Forward]
Balance as of beginning of period		$ 638,000us-gaap_RestructuringReserve	$ 1,662,000us-gaap_RestructuringReserve		$ 5,198,000us-gaap_RestructuringReserve
Provision		19,383,000us-gaap_RestructuringCharges	5,538,000us-gaap_RestructuringCharges	5,834,000us-gaap_RestructuringCharges
Cash payments		(7,494,000)us-gaap_PaymentsForRestructuring	(6,562,000)us-gaap_PaymentsForRestructuring	(9,370,000)us-gaap_PaymentsForRestructuring
Restructuring Reserve, Translation Adjustment		(2,015,000)
Balance as of end of period		10,512,000us-gaap_RestructuringReserve	638,000us-gaap_RestructuringReserve	1,662,000us-gaap_RestructuringReserve	5,198,000us-gaap_RestructuringReserve
Cost of Revenues
Restructuring Reserve [Roll Forward]
Balance as of beginning of period		0	26,000		1,606,000
Provision			0	557,000
Cash payments		0	(26,000)	(2,137,000)
Restructuring Reserve, Translation Adjustment		0
Balance as of end of period		0	0	26,000	1,606,000
Operating Expenses
Restructuring Reserve [Roll Forward]
Balance as of beginning of period		638,000	1,636,000		3,592,000
Provision		1,078,000	5,538,000	5,277,000
Cash payments		(1,421,000)	(6,536,000)	(7,233,000)
Restructuring Reserve, Translation Adjustment		0
Balance as of end of period		295,000	638,000	1,636,000	3,592,000
Video Processing Product Lines \| Employee Retention
Restructuring Reserve [Roll Forward]
Provision				1,100,000
Oregon Facility \| Employee Retention
Restructuring Reserve [Roll Forward]
Cash payments				(1,000,000)
Other Restructuring Plan, 2015 Restructuring \| Employee Severance
Restructuring Reserve [Roll Forward]
Provision		1,100,000
Balance as of end of period		300,000
Number of positions eliminated		28
Restructuring cost incurred		800,000
Other Restructuring Plan, 2014 Restructuring \| Employee Severance
Restructuring Reserve [Roll Forward]
Number of positions eliminated		117
Restructuring cost incurred		600,000	4,900,000
Restructuring charges		5,500,000
Other Restructuring Plan, 2013 Restructuring \| Employee Severance
Restructuring Reserve [Roll Forward]
Cash payments			(1,100,000)	(3,200,000)
Number of positions eliminated				132
Restructuring charges				4,300,000
High-Speed Converter Business
Restructuring Reserve [Roll Forward]
Balance as of beginning of period		0	0		0
Provision	11,900,000	18,305,000	0	0
Cash payments		(6,073,000)	0	0
Restructuring Reserve, Translation Adjustment		(2,015,000)
Balance as of end of period		10,217,000	0	0	0
High-Speed Converter Business \| Employee Severance
Restructuring Reserve [Roll Forward]
Provision		$ 18,305,000
Number of positions eliminated		53