Restructuring, acquisition and integration-related costs (Restructuring and Related Costs by Type of Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Restructuring Cost and Reserve [Line Items]
Acquisition transaction-related costs	$ 2,725		$ 7,403
Restructuring, acquisition and integration-related costs			18,716	$ 14,078
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	5,828	$ 3,862	26,135	9,396
Acquisition integration-related costs	1,463	3,399	3,473	10,257
Restructuring, acquisition and integration-related costs	7,291	7,261	29,608	19,653
Accelerated depreciation included in restructuring costs	1,080		8,650
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	150	1,465	1,231	4,682
Acquisition integration-related costs	2,604	5,287	5,542	12,572
Acquisition transaction-related costs	2,725	0	7,403	0
Restructuring, acquisition and integration-related costs	$ 5,479	$ 6,752	$ 14,176	$ 17,254