Income Taxes (Details) (USD $)	9 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Dec. 26, 2010
Effective tax rate	(356.80%)	32.70%
Net deferred tax assets	$ 12,700,000		$ 61,500,000
Valuation allowance	48,000,000
Other current assets	62,699,000		32,655,000
Current income tax receivable	17,600,000
Estimated tax payments	7,900,000
Income tax benefit	9,700,000
Other current liabilities	28,790,000		23,019,000
Current deferred tax liability	1,800,000
Total amount of gross unrecognized tax benefits that, if recognized, would affect the effective tax rate	11,900,000		12,800,000
Interest and penalties benefit	200,000	(2,700,000)
Accrued interest and penalties related to unrecognized tax benefits	3,800,000		3,600,000
Expected change of gross unrecognized benefits, minimum	3,300,000
Expected change of gross unrecognized benefits, maximum	3,500,000
Maximum [Member] | United States [Member]
Open tax years currently under audit	2008
Maximum [Member] | Germany [Member]
Open tax years currently under audit	2005
Maximum [Member] | Finland [Member]
Open tax years currently under audit	2009
Maximum [Member] | Sweden [Member]
Open tax years currently under audit	2009
Minimum [Member] | United States [Member]
Open tax years currently under audit	2007
Minimum [Member] | Germany [Member]
Open tax years currently under audit	2002
Minimum [Member] | Finland [Member]
Open tax years currently under audit	2005
Minimum [Member] | Sweden [Member]
Open tax years currently under audit	2007
Jurisdiction One [Member]
Net deferred tax assets			41,700,000
Jurisdiction Two [Member]
Net deferred tax assets			$ 9,600,000