Quarterly Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Mar. 30, 2013	Mar. 31, 2012	Apr. 02, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 39,574,000	$ 37,930,000	$ 80,152,000	$ 58,969,000	$ 45,492,000	$ 49,807,000	$ 81,884,000	$ 77,046,000	$ 216,625,000	$ 254,229,000	$ 256,811,000
Gross profit	(6,153,000)	13,233,000	33,520,000	23,653,000	16,829,000	21,161,000	35,941,000	33,760,000	64,253,000	107,691,000	108,949,000
Net operating expenses	24,698,000	3,835,000	25,641,000	25,197,000	27,305,000	25,285,000	25,626,000	28,280,000	79,371,000	106,496,000	101,521,000
Provision for (benefit from) income taxes	35,217,000	2,625,000	2,759,000	(750,000)	(2,752,000)	(2,196,000)	1,372,000	2,159,000	39,851,000	(1,417,000)	390,000
Net income (loss)	(65,751,000)	6,768,000	5,211,000	(944,000)	(7,665,000)	(1,881,000)	8,537,000	5,913,000	(54,716,000)	4,904,000	7,934,000
Basic net (loss) income per share	$ (2.23)	$ 0.23	$ 0.18	$ (0.03)	$ (0.26)	$ (0.07)	$ 0.30	$ 0.21	$ (1.86)	$ 0.17	$ 0.28
Diluted net (loss) income per share	$ (2.23)	$ 0.23	$ 0.17	$ (0.03)	$ (0.26)	$ (0.07)	$ 0.29	$ 0.20	$ (1.86)	$ 0.17	$ 0.28
Dividends per outstanding common share - declared	$ 0.08	$ 2.08	$ 0.08	$ 0.08	$ 0	$ 0.08	$ 0	$ 0
Cash dividends paid per common share	$ 0.08	$ 2.08	$ 0.08	$ 0.08	$ 0.08	$ 0	$ 0	$ 0	$ 2.32	$ 0.08	$ 0
Other information
Inventory write-off	19,800,000	1,200,000			2,000,000
Intangible assets write off	2,300,000
Restructuring costs	2,600,000				2,900,000	900,000			2,612,000	3,785,000	797,000
Loss on disposal of assets	1,000,000	1,300,000			(1,000,000)				1,226,000	(966,000)	0
Valuation allowance on deferred tax assets	46,900,000
Legal settlement costs	100,000	15,400,000						600,000	15,262,000	(550,000)	(1,367,000)
Gain on sale of previously impaired auction rate securities								$ 2,700,000	$ 0	$ 2,729,000	$ 708,000