Commitments, contingencies and other (Narrative) (Details)	3 Months Ended		6 Months Ended			12 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012 USD ($)	Jul. 02, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2012 EUR (€)	Jul. 02, 2011 USD ($)	Dec. 31, 2008 EUR (€)	Jun. 30, 2012 Cost of Sales [Member] USD ($)	Jul. 02, 2011 Cost of Sales [Member] USD ($)	Jun. 30, 2012 Cost of Sales [Member] USD ($)	Jul. 02, 2011 Cost of Sales [Member] USD ($)	Jun. 30, 2012 Selling, General and Administrative [Member] USD ($)	Jul. 02, 2011 Selling, General and Administrative [Member] USD ($)	Jun. 30, 2012 Selling, General and Administrative [Member] USD ($)	Jul. 02, 2011 Selling, General and Administrative [Member] USD ($)
Commitments And Contingencies [Line Items]
Assessment received from Belgian tax authority						€ 24,000,000
Interest on assessment				2,500,000
Interest rate on assessment			7.00%	7.00%
Pre-tax business restructuring charges	$ 8,226,000	$ 6,514,000	$ 8,226,000		$ 13,327,000		$ 6,636,000	$ 5,532,000	$ 6,636,000	$ 11,879,000	$ 1,590,000	$ 982,000	$ 1,590,000	$ 1,448,000