Restructuring, acquisition and integration-related costs (Restructuring and Related Costs by Type of Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring, acquisition and integration-related costs			$ 14,078	$ 42,062
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	3,862	9,786	9,396	24,116
Acquisition integration-related costs	3,399	4,913	10,257	8,328
Restructuring, acquisition and integration-related costs	7,261	14,699	19,653	32,444
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,465	3,887	4,682	17,946
Acquisition transaction-related costs	0	402	0	14,214
Acquisition integration-related costs	5,287	5,423	12,572	10,984
Restructuring, acquisition and integration-related costs	$ 6,752	$ 9,712	$ 17,254	$ 43,144