Restructuring (Details) (USD $)	12 Months Ended									3 Months Ended	12 Months Ended			3 Months Ended		12 Months Ended								3 Months Ended
	Mar. 30, 2014 Employees	Mar. 31, 2013 Employees	Apr. 01, 2012	Mar. 30, 2014 Cost of Revenues	Mar. 31, 2013 Cost of Revenues	Apr. 01, 2012 Cost of Revenues	Mar. 30, 2014 Operating Expenses	Mar. 31, 2013 Operating Expenses	Apr. 01, 2012 Operating Expenses	Jun. 30, 2013 Employee Severance	Mar. 30, 2014 Employee Severance	Mar. 31, 2013 Employee Severance	Mar. 28, 2010 Employee Severance	Oct. 02, 2005 Facility Closing	Mar. 30, 2014 Facility Closing	Mar. 30, 2014 Smart Meter business Employee Severance	Mar. 31, 2013 Video Processing Product Lines Employee Retention	Apr. 01, 2012 Video Processing Product Lines Employee Retention	Mar. 31, 2013 Oregon Facility Employee Retention	Apr. 01, 2012 Oregon Facility Employee Retention	Apr. 01, 2012 Oregon Facility Employee Severance	Apr. 03, 2011 Singapore Facility Facility Closing	Mar. 31, 2013 Singapore Facility Facility Closing	Dec. 27, 2009 Other Facilities Facility Closing	Oct. 02, 2005 Cost of revenue Facility Closing	Oct. 02, 2005 Research and development Facility Closing	Oct. 02, 2005 Selling, general and administrative expenses Facility Closing
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	$ 1,662,000	$ 5,198,000	$ 10,002,000	$ 26,000	$ 1,606,000	$ 9,187,000	$ 1,636,000	$ 3,592,000	$ 815,000
Provision	5,538,000	5,834,000	3,090,000	0	557,000	(1,425,000)	5,538,000	5,277,000	4,515,000			400,000	4,800,000				1,100,000	3,600,000	2,500,000			500,000
Cash payments	(6,562,000)	(9,370,000)	(7,894,000)	(26,000)	(2,137,000)	(6,156,000)	(6,536,000)	(7,233,000)	(1,738,000)	(1,100,000)	(4,900,000)	(3,200,000)				(400,000)	(4,700,000)		(1,000,000)
Balance as of end of period	638,000	1,662,000	5,198,000	0	26,000	1,606,000	638,000	1,636,000	3,592,000
Restructuring Costs	5,500,000	4,300,000
Restructuring and Related Cost, Number of Positions Eliminated	117	132
Restructuring Reserve, Accrual Adjustment																					3,100,000
Quantifying Misstatement in Current Year Financial Statements, Amount																				4,100,000
Lease payments made since initial restructuring															2,100,000								500,000
Lease impairment charges														2,100,000										900,000	600,000	900,000	600,000
Future minimum payments due during fiscal 2014	$ 3,926,000														$ 200,000