Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011	Dec. 25, 2011	Sep. 25, 2011
Income Taxes [Line Items]
Effective tax rate			4.20%	18.10%
Goodwill impairment	$ 64,437,000	$ 0	$ 64,437,000	$ 0
Restructuring related asset impairment			5,297,000	0
Tax effect of discrete items			(1,200,000)
Net deferred tax assets	10,700,000		10,700,000		11,700,000
Valuation allowance						48,000,000
Current income tax receivable	8,800,000		8,800,000
Estimated tax payments	4,200,000		4,200,000
Income tax benefit			4,600,000
Current deferred tax liability	4,600,000		4,600,000
Unrecognized tax benefit, if recognized, would affect the effective tax rate	11,500,000		11,500,000		13,200,000
Interest and penalties expense			800,000	0
Accrued interest and penalties related to unrecognized tax benefits	3,800,000		3,800,000		4,600,000
Expected change of gross unrecognized tax benefits, maximum	$ 2,300,000		$ 2,300,000
Maximum [Member] | United States [Member]
Income Taxes [Line Items]
Open tax years currently under audit			2008
Maximum [Member] | Germany [Member]
Income Taxes [Line Items]
Open tax years currently under audit			2009
Maximum [Member] | Finland [Member]
Income Taxes [Line Items]
Open tax years currently under audit			2009
Minimum [Member] | United States [Member]
Income Taxes [Line Items]
Open tax years currently under audit			2007
Minimum [Member] | Germany [Member]
Income Taxes [Line Items]
Open tax years currently under audit			2006
Minimum [Member] | Finland [Member]
Income Taxes [Line Items]
Open tax years currently under audit			2008