Restructuring Charges 2012 Restructuring Activities (Details) (USD $)	3 Months Ended											12 Months Ended			3 Months Ended								12 Months Ended	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended			12 Months Ended				3 Months Ended			12 Months Ended				3 Months Ended		12 Months Ended
	Dec. 29, 2012		Sep. 29, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011		Mar. 26, 2011	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010	Jun. 30, 2012 Q2 2012 Restructuring Activities [Member] Employee	Jun. 26, 2010 Q2 2010 Restructuring Plan [Member] Employee	Mar. 27, 2010 Q1 2010 Restructuring Plan [Member] Employee	Dec. 29, 2012 Q4 2010 Restructuring Plan [Member]	Dec. 25, 2010 Q4 2010 Restructuring Plan [Member] Employee	Dec. 29, 2012 Q3 2012 Restructuring Plan [Member] Employee	Sep. 29, 2012 Q3 2012 Restructuring Plan [Member] Employee	Dec. 31, 2011 Q4 2011 Restructuring Plan [Member]	Dec. 31, 2011 Q4 2011 Restructuring Plan [Member] Employee	Jun. 30, 2012 Employee Severance [Member]	Jun. 26, 2010 Employee Severance [Member]	Dec. 26, 2009 Employee Severance [Member] Restructuring 2009 Plan Accrual [Member]	Sep. 25, 2010 Employee Severance [Member] Q3 2010 Restructuring Plan [Member]	Dec. 25, 2010 Employee Severance [Member] 2010 Restructuring Plan [Member]	Mar. 27, 2010 Employee Severance [Member] Q1 2010 Restructuring Plan [Member]	Dec. 25, 2010 Employee Severance [Member] Q1 2010 Restructuring Plan [Member]	Dec. 31, 2011 Employee Severance [Member] 2011 Restructuring Plan [Member]	Dec. 29, 2012 Employee Severance [Member] 2012 Restructuring Plan [Member]	Dec. 29, 2012 Employee Severance [Member] Q3 2012 Restructuring Plan [Member]	Sep. 29, 2012 Employee Severance [Member] Q3 2012 Restructuring Plan [Member]	Dec. 26, 2009 Property and Equipment Impairment [Member] Restructuring 2009 Plan Accrual [Member]	Dec. 25, 2010 Property and Equipment Impairment [Member] 2010 Restructuring Plan [Member]	Dec. 25, 2010 Property and Equipment Impairment [Member] Q1 2010 Restructuring Plan [Member]	Dec. 31, 2011 Property and Equipment Impairment [Member] 2011 Restructuring Plan [Member]	Dec. 29, 2012 Property and Equipment Impairment [Member] 2012 Restructuring Plan [Member]	Dec. 25, 2010 Property and Equipment Impairment [Member] Q4 2010 Restructuring Plan [Member]	Sep. 29, 2012 Property and Equipment Impairment [Member] Q3 2012 Restructuring Plan [Member]	Dec. 26, 2009 Contract Termination [Member] Restructuring 2009 Plan Accrual [Member]	Dec. 25, 2010 Contract Termination [Member] 2010 Restructuring Plan [Member]	Dec. 25, 2010 Contract Termination [Member] Q1 2010 Restructuring Plan [Member]	Dec. 31, 2011 Contract Termination [Member] 2011 Restructuring Plan [Member]	Dec. 29, 2012 Contract Termination [Member] 2012 Restructuring Plan [Member]	Sep. 29, 2012 Contract Termination [Member] Q3 2012 Restructuring Plan [Member]	Dec. 26, 2009 Total [Member] Restructuring 2009 Plan Accrual [Member]	Dec. 25, 2010 Total [Member] 2010 Restructuring Plan [Member]	Dec. 25, 2010 Total [Member] Q1 2010 Restructuring Plan [Member]	Dec. 31, 2011 Total [Member] 2011 Restructuring Plan [Member]	Dec. 29, 2012 Total [Member] 2012 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Quarterly Savings																		$ 100,000			$ 2,600,000	$ 300,000
Restructuring Reserve											1,800,000		1,800,000													973,000									0							76,000						1,049,000
Restructuring Charges	333,000	[1]	2,481,000	136,000	[2]	(33,000)	325,000	258,000	(1,099,000)	[3]	1,038,000	2,917,000	522,000	15,908,000			3,400,000					300,000		100,000	4,800,000		1,000,000	10,057,000			2,300,000	2,261,000	400,000	1,800,000		8,787,000		0	462,000	400,000	0						200,000		19,255,000		2,300,000	2,917,000
Other Restructuring Costs																																											411,000		0	194,000
Restructuring Reserve, Accrual Adjustment																												0	3,300,000	(3,282,000)	0	0				0	0	0	0				(76,000)	0	(374,000)	31,000			76,000	(3,282,000)	(374,000)	31,000
Restructuring Reserve, Settled with Cash																												(6,184,000)			(3,039,000)	(1,913,000)				0		0	0				0		(77,000)	(157,000)			(6,184,000)		(3,116,000)	(2,070,000)
Restructuring Reserve, Settled without Cash																												(182,000)			(443,000)					(8,787,000)		0	(462,000)				40,000		0				(8,929,000)		(443,000)	(462,000)
Restructuring Reserve														$ 1,800,000												$ 973,000		$ 1,382,000			$ 200,000	$ 548,000			$ 0	$ 0		$ 0	$ 0			$ 76,000	$ 451,000		$ 0	$ 68,000		$ 1,049,000	$ 1,833,000		$ 200,000	$ 616,000
Restructuring and Related Cost, Expected Number of Positions Eliminated															1	67	106		10	4	44		8

[1] In the fourth quarter of fiscal 2012, we recorded an income tax benefit in the amount of $25.5 million from the release of deferred tax asset valuation allowances due to deferred tax liabilities established on the acquired identifiable intangible assets from our acquisition of MicroProbe and $3.3 million benefit from the settlement of patent litigation in conjunction with the acquisition of MicroProbe. The fourth quarter of fiscal 2012 includes the following Microprobe operating activity: $19.8 million in revenue, $5.4 million amortization of intangibles, $2.6 million release of pre-existing backlog, $3.5 million release of inventory fair value step-up and $0.2 million charge for step-up depreciation on fixed assets resulting in a net loss of $6.4 million.

[2] In the second quarter of fiscal 2012, we recorded a tax benefit in the amount of $1.6 million from the release of a deferred tax valuation allowance recorded in a non-U.S. jurisdiction. This benefit resulted in an overall income tax benefit, rather than an income tax provision in the second quarter of fiscal 2012.

[3] In the second quarter of fiscal 2011, we recorded a tax benefit in the amount of $2.5 million from the release of a deferred tax valuation allowance recorded in a non-U.S. jurisdiction. This benefit resulted in an overall income tax benefit, rather than an income tax provision in the second quarter of fiscal 2011.