Condensed consolidating guarantor financial information Condensed consolidating statements of cash flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net cash (used in) provided by operating activities from continuing operations	$ 176,760	$ 208,798
Cash Flows from Investing Activities of Continuing Operations:
Expenditures for property, plant and equipment	(45,566)	(48,220)
Payments for businesses and intangibles acquired, net of cash acquired	(63,451)	(28,535)
Proceeds from sale of assets	408	5,251
Investments in affiliates	0	(40)
Net cash used in investing activities from continuing operations	(108,609)	(71,544)
Cash Flows from Financing Activities of Continuing Operations:
Proceeds from new borrowings	288,100	250,000
Reduction in borrowings	(303,627)	(480,009)
Debt extinguishment, issuance and amendment fees	(9,017)	(3,689)
Proceeds from share based compensation plans and the related tax impacts	4,815	2,936
Payments to noncontrolling interest shareholders	(833)	(1,094)
Payments for contingent consideration	(7,974)	0
Proceeds from issuance of shares	0
Dividends paid	(42,382)	(42,174)
Intercompany transactions	0	0
Intercompany dividends paid	0	0
Net cash used in financing activities from continuing operations	(70,918)	(274,030)
Cash Flows from Discontinued Operations:
Net cash used in operating activities	(1,954)	(1,946)
Net cash used in discontinued operations	(1,954)	(1,946)
Effect of exchange rate changes on cash and cash equivalents	(22,052)	(6,880)
Net decrease in cash and cash equivalents	(26,773)	(145,602)
Cash and cash equivalents at the beginning of the period	303,236	431,984
Cash and cash equivalents at the end of the period	276,463	286,382
Consolidation, Eliminations
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net cash (used in) provided by operating activities from continuing operations	(2,360)	(4,429)
Cash Flows from Investing Activities of Continuing Operations:
Expenditures for property, plant and equipment	0	0
Payments for businesses and intangibles acquired, net of cash acquired	0	0
Proceeds from sale of assets	0	0
Investments in affiliates	121,850	0
Net cash used in investing activities from continuing operations	121,850	0
Cash Flows from Financing Activities of Continuing Operations:
Proceeds from new borrowings	0	0
Reduction in borrowings	0	0
Debt extinguishment, issuance and amendment fees	0	0
Proceeds from share based compensation plans and the related tax impacts	0	0
Payments to noncontrolling interest shareholders	0	0
Payments for contingent consideration	0
Proceeds from issuance of shares	(121,850)
Dividends paid	0	0
Intercompany transactions	0	0
Intercompany dividends paid	2,360	4,429
Net cash used in financing activities from continuing operations	(119,490)	4,429
Cash Flows from Discontinued Operations:
Net cash used in operating activities	0	0
Net cash used in discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents at the beginning of the period	0	0
Cash and cash equivalents at the end of the period	0	0
Parent Company
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net cash (used in) provided by operating activities from continuing operations	(124,131)	(80,538)
Cash Flows from Investing Activities of Continuing Operations:
Expenditures for property, plant and equipment	(122)	(2,146)
Payments for businesses and intangibles acquired, net of cash acquired	0	0
Proceeds from sale of assets	408	1,669
Investments in affiliates	0	(60)
Net cash used in investing activities from continuing operations	286	(537)
Cash Flows from Financing Activities of Continuing Operations:
Proceeds from new borrowings	288,100	250,000
Reduction in borrowings	(303,627)	(480,009)
Debt extinguishment, issuance and amendment fees	(9,017)	(3,689)
Proceeds from share based compensation plans and the related tax impacts	4,815	2,936
Payments to noncontrolling interest shareholders	0	0
Payments for contingent consideration	0
Proceeds from issuance of shares	0
Dividends paid	(42,382)	(42,174)
Intercompany transactions	196,963	372,763
Intercompany dividends paid	0	0
Net cash used in financing activities from continuing operations	134,852	99,827
Cash Flows from Discontinued Operations:
Net cash used in operating activities	(1,105)	(1,946)
Net cash used in discontinued operations	(1,105)	(1,946)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	9,902	16,806
Cash and cash equivalents at the beginning of the period	27,996	42,749
Cash and cash equivalents at the end of the period	37,898	59,555
Guarantor Subsidiaries
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net cash (used in) provided by operating activities from continuing operations	88,937	314,211
Cash Flows from Investing Activities of Continuing Operations:
Expenditures for property, plant and equipment	(25,072)	(22,578)
Payments for businesses and intangibles acquired, net of cash acquired	(30,336)	0
Proceeds from sale of assets	0	3,421
Investments in affiliates	0	20
Net cash used in investing activities from continuing operations	(55,408)	(19,137)
Cash Flows from Financing Activities of Continuing Operations:
Proceeds from new borrowings	0	0
Reduction in borrowings	0	0
Debt extinguishment, issuance and amendment fees	0	0
Proceeds from share based compensation plans and the related tax impacts	0	0
Payments to noncontrolling interest shareholders	0	0
Payments for contingent consideration	(7,974)
Proceeds from issuance of shares	121,850
Dividends paid	0	0
Intercompany transactions	(147,365)	(307,912)
Intercompany dividends paid	0	0
Net cash used in financing activities from continuing operations	(33,489)	(307,912)
Cash Flows from Discontinued Operations:
Net cash used in operating activities	0	0
Net cash used in discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	40	(12,838)
Cash and cash equivalents at the beginning of the period	0	14,500
Cash and cash equivalents at the end of the period	40	1,662
Non-Guarantor Subsidiaries
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net cash (used in) provided by operating activities from continuing operations	214,314	(20,446)
Cash Flows from Investing Activities of Continuing Operations:
Expenditures for property, plant and equipment	(20,372)	(23,496)
Payments for businesses and intangibles acquired, net of cash acquired	(33,115)	(28,535)
Proceeds from sale of assets	0	161
Investments in affiliates	(121,850)	0
Net cash used in investing activities from continuing operations	(175,337)	(51,870)
Cash Flows from Financing Activities of Continuing Operations:
Proceeds from new borrowings	0	0
Reduction in borrowings	0	0
Debt extinguishment, issuance and amendment fees	0	0
Proceeds from share based compensation plans and the related tax impacts	0	0
Payments to noncontrolling interest shareholders	(833)	(1,094)
Payments for contingent consideration	0
Proceeds from issuance of shares	0
Dividends paid	0	0
Intercompany transactions	(49,598)	(64,851)
Intercompany dividends paid	(2,360)	(4,429)
Net cash used in financing activities from continuing operations	(52,791)	(70,374)
Cash Flows from Discontinued Operations:
Net cash used in operating activities	(849)	0
Net cash used in discontinued operations	(849)	0
Effect of exchange rate changes on cash and cash equivalents	(22,052)	(6,880)
Net decrease in cash and cash equivalents	(36,715)	(149,570)
Cash and cash equivalents at the beginning of the period	275,240	374,735
Cash and cash equivalents at the end of the period	$ 238,525	$ 225,165