Revision of Prior Period Financial Statements (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended			6 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended	6 Months Ended
	Jan. 01, 2012	Jan. 02, 2011	Jan. 01, 2012	Jan. 02, 2011	Apr. 03, 2011	Oct. 02, 2011 Adjustments [Member]	Jul. 03, 2011 Adjustments [Member]	Jan. 02, 2011 Adjustments [Member]	Oct. 02, 2011 Adjustments [Member]	Jan. 02, 2011 Adjustments [Member]	Apr. 03, 2011 Adjustments [Member]	Jan. 02, 2011 As Reported [Member]		Jan. 02, 2011 As Reported [Member]		Apr. 03, 2011 As Reported [Member]	Jan. 01, 2012 Errors Related To Retention Bonuses Associated with Plan to Close Manufacturing Facility [Member]	Oct. 02, 2011 Errors Related to Retention Bonuses for Certain Key Employees [Member]	Oct. 02, 2011 Errors Related to Accounts Payable System Related Issues [Member]
Expense (benefit) associated with identified errors																	$ 6,400,000	$ 500,000	$ (1,000,000)
Consolidated Statement of Operations
Cost of revenues	56,093,000	67,177,000	190,627,000	213,222,000				670,000		2,010,000		66,507,000	[1]	211,212,000	[1]
Gross profit	63,884,000	80,347,000	216,953,000	247,493,000				(670,000)		(2,010,000)		81,017,000	[1]	249,503,000	[1]
Research and development	38,410,000	40,674,000	117,409,000	116,774,000				54,000		162,000		40,620,000	[1]	116,612,000	[1]
Selling, general and administrative	23,661,000	26,017,000	74,478,000	77,732,000				20,000		60,000		25,997,000	[1]	77,672,000	[1]
Total operating expenses	62,071,000	66,691,000	191,887,000	194,506,000				74,000		222,000		66,617,000	[1]	194,284,000	[1]
Operating income	1,813,000	13,656,000	25,066,000	52,987,000				(744,000)		(2,232,000)		14,400,000	[1]	55,219,000	[1]
Income from continuing operations before income taxes	(327,000)	15,008,000	21,142,000	55,780,000				(744,000)		(2,232,000)		15,752,000	[1]	58,012,000	[1]
Provision for income taxes	576,000	111,000	1,176,000	1,659,000				59,000		221,000		52,000	[1]	1,438,000	[1]
Net income from continuing operations	(903,000)	14,897,000	19,966,000	54,121,000				(803,000)		(2,453,000)		15,700,000	[1]	56,574,000	[1]
Net income	(6,193,000)	9,794,000	45,708,000	38,781,000		(800,000)	(1,500,000)	(803,000)	(2,300,000)	(2,453,000)		10,597,000	[1]	41,234,000	[1]
Basic income (loss) per share:
Basic net income (loss) per share - continuing operations (in dollars per share)	$ (0.01)	$ 0.10	$ 0.14	$ 0.35				$ 0		$ (0.02)		$ 0.10	[1]	$ 0.37	[1]
Basic net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.06	$ 0.32	$ 0.25				$ (0.01)		$ (0.02)		$ 0.07	[1]	$ 0.27	[1]
Diluted net income (loss) per share:
Diluted net income (loss) per share - continuing operations (in dollars per share)	$ (0.01)	$ 0.10	$ 0.14	$ 0.35				$ 0		$ (0.02)		$ 0.10	[1]	$ 0.37	[1]
Diluted net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.06	$ 0.31	$ 0.25				$ (0.01)		$ (0.02)		$ 0.07	[1]	$ 0.27	[1]
Consolidated Balance Sheets
Accounts payable	23,351,000		23,351,000		35,419,000						(1,051,000)					36,470,000
Accrued compensation and related expenses	33,402,000		33,402,000		32,784,000						4,572,000					28,212,000
Other accrued liabilities	21,870,000		21,870,000		30,886,000
Total current liabilities	94,978,000		94,978,000		114,166,000						3,521,000					110,645,000
Total liabilities	114,765,000		114,765,000		132,199,000						3,521,000					128,678,000
Accumulated deficit	(794,887,000)		(794,887,000)		(840,596,000)						(3,521,000)					(837,075,000)
Total stockholders' equity	$ 602,029,000		$ 602,029,000		$ 595,261,000						$ (3,521,000)					$ 598,782,000

[1] Reflect's previously reported amounts as adjusted for discontinued operations (see Note 6).