Restructuring Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Jan. 01, 2012 employees	Apr. 03, 2011
Restructuring Cost and Reserve [Line Items]
Number of employees involuntarily terminated (in employees)		200
Restructuring Reserve
Amount recorded in accrued liabilities at period start	$ 3,526
Additional expenses recorded during period	2,622		0
Cash paid during period	(5,047)
Amount recorded in accrued liabilities at period end	1,101	3,526
Cumulative expense recorded since inception	10,758
Estimated total restructuring costs to be incurred	13,855
Employee Separation Costs [Member]
Restructuring Reserve
Amount recorded in accrued liabilities at period start	3,496
Additional expenses recorded during period	2,257
Cash paid during period	(4,793)
Amount recorded in accrued liabilities at period end	960
Cumulative expense recorded since inception	9,940
Estimated total restructuring costs to be incurred	10,937
Facilities Exit Costs [Member]
Restructuring Reserve
Amount recorded in accrued liabilities at period start	0
Additional expenses recorded during period	0
Cash paid during period	0
Amount recorded in accrued liabilities at period end	0
Cumulative expense recorded since inception	0
Estimated total restructuring costs to be incurred	1,500
Other Costs [Member]
Restructuring Reserve
Amount recorded in accrued liabilities at period start	30
Additional expenses recorded during period	365
Cash paid during period	(254)
Amount recorded in accrued liabilities at period end	141
Cumulative expense recorded since inception	818
Estimated total restructuring costs to be incurred	$ 1,418