Restructuring (Details) (USD $)	9 Months Ended						12 Months Ended			3 Months Ended		3 Months Ended
	Jan. 01, 2012	Jan. 01, 2012 Cost of Goods Sold [Member]	Jan. 01, 2012 Operating Expenses [Member]	Jan. 01, 2012 Employee Retention [Member] Video Processing Product Lines [Member]	Jan. 01, 2012 Employee Retention [Member] Oregon Facility [Member]	Jan. 01, 2012 Employee Severance [Member] Oregon Facility [Member]	Mar. 28, 2010 Employee Severance [Member] Oregon Facility [Member]	Apr. 03, 2011 Facility Closing [Member] Singapore Facility [Member]	Jan. 01, 2012 Facility Closing [Member] Singapore Facility [Member]	Dec. 27, 2009 Facility Closing [Member] Other Facilities [Member]	Jan. 01, 2012 Facility Closing [Member] Other Facilities [Member]	Oct. 02, 2005 Facility Closing [Member] Salinas Facility [Member]	Jan. 01, 2012 Facility Closing [Member] Salinas Facility [Member]
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	$ 10,002,000	$ 9,187,000	$ 815,000
Provision	1,566,000	(1,425,000)	2,991,000
Cash payments	(407,000)	(166,000)	(241,000)
Balance as of end of period	11,161,000	7,596,000	3,565,000	1,900,000	6,700,000	1,900,000
Restructuring expenses				1,900,000	2,600,000		4,800,000
Increase (decrease) in restructuring accrual						(2,900,000)
Lease impairment charges								500,000		500,000		2,100,000
Cost of revenues portion of lease impairment charges												600,000
R and D expense portion of lease impairment charges												900,000
SG and A expense portion of lease impairment charges												600,000
Lease payments made since initial restructuring									400,000		400,000		1,600,000
Remaining accrued lease liabilities									$ 100,000		$ 100,000		$ 500,000