Note 11. Net Income (Loss) Per Share (Detail) - Summary of Net Income (Loss) per Share (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 income (loss) (in Dollars)	$ 1,672	$ 1,523	$ 263	$ (576)	$ (20,820)	$ (4,733)	$ (1,077)	$ (1,426)	$ 2,882	$ (28,056)	$ (35,668)
Shares used in computation of net income (loss) per share:
Basic	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	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
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)