Restructuring, acquisition and integration-related costs (Restructuring and Related Costs by Type of Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring, acquisition and integration-related costs			$ 8,751	$ 28,389
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	3,475	11,324	5,534	14,330
Acquisition integration-related costs	3,280	3,010	6,858	3,345
Restructuring, acquisition and integration-related costs	6,755	14,334	12,392	17,675
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	615	8,843	3,217	14,059
Acquisition transaction-related costs	0	13,812	0	13,812
Acquisition integration-related costs	3,799	4,331	7,285	5,630
Restructuring, acquisition and integration-related costs	$ 4,414	$ 26,986	$ 10,502	$ 33,501