Note 21. Supplementary Quarterly Financial Data (Unaudited) (Detail) - Selected Unaudited Quarterly Financial Data (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Jan. 01, 2012	Oct. 02, 2011	Jul. 03, 2011	Mar. 31, 2013	Apr. 01, 2012	Mar. 27, 2011
Net sales by end market:
Net sales by end market	$ 31,154	$ 30,999	$ 30,622	$ 29,251	$ 27,789	$ 29,679	$ 36,120	$ 36,978	$ 85,856	$ 89,988	$ 101,721
Gross profit	15,296	14,192	13,330	12,869	9,009	13,345	16,729	16,841	55,687	55,924	63,997
Income (loss) from operations	1,309	(353)	(373)	(1,166)	(21,522)	(5,435)	(1,482)	(2,154)	(583)	(30,593)	(40,018)
Net income (loss)	1,672	1,523	263	(576)	(20,820)	(4,733)	(1,077)	(1,426)	2,882	(28,056)	(35,668)
Net income (loss) per share:
Basic (in Dollars per share)	$ 0.04	$ 0.03	$ 0.01	$ (0.01)	$ (0.46)	$ (0.11)	$ (0.02)	$ (0.03)	$ 0.06	$ (0.63)	$ (0.81)
Diluted (in Dollars per share)	$ 0.04	$ 0.03	$ 0.01	$ (0.01)	$ (0.46)	$ (0.11)	$ (0.02)	$ (0.03)	$ 0.06	$ (0.63)	$ (0.81)
Shares used in the computation of net income (loss) per share:
Basic (in Shares)	46,219	45,925	45,720	45,388	45,012	44,830	44,759	44,599	45,809,000	44,796,000	44,218,000
Diluted (in Shares)	47,379	46,438	46,046	45,388	45,012	44,830	44,759	44,599	46,476,000	44,796,000	44,218,000
Industrial And Embedded Systems [Member]
Net sales by end market:
Net sales by end market	15,265	16,119	15,923	16,088	16,396	15,136	18,060	17,010
Networking And Storage [Member]
Net sales by end market:
Net sales by end market	9,346	9,300	7,656	6,435	3,890	7,420	8,669	7,026
Communications Infrastructure [Member]
Net sales by end market:
Net sales by end market	6,231	5,270	6,737	6,728	6,669	6,826	9,391	12,942
All Other Segments [Member]
Net sales by end market:
Net sales by end market	$ 312	$ 310	$ 306		$ 834	$ 297