Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ (46,794)	$ (86,534)	$ (46,349)	$ (83,745)
Other comprehensive income before reclassifications	(12,888)	8,866	(14,882)	3,011
Amounts reclassified from accumulated other comprehensive income	973	1,469	2,522	4,535
Ending Balance	(58,709)	(76,199)	(58,709)	(76,199)
Reclassification detail
Reclassification after tax	973	1,469	2,522	4,535
Pension and Postretirement Medical
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(48,583)	(76,650)	(50,132)	(79,716)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	973	1,469	2,522	4,535
Ending Balance	(47,610)	(75,181)	(47,610)	(75,181)
Reclassification detail
Reclassification before tax	1,463	2,304	3,876	7,090
Income tax (benefit)	(490)	(835)	(1,354)	(2,555)
Reclassification after tax	973	1,469	2,522	4,535
Pension and Postretirement Medical | Cost of products sold
Reclassification detail
Reclassification before tax	536	824	1,412	2,577
Pension and Postretirement Medical | Product development
Reclassification detail
Reclassification before tax	234	368	616	1,131
Pension and Postretirement Medical | Selling, marketing and distribution
Reclassification detail
Reclassification before tax	427	663	1,116	1,987
Pension and Postretirement Medical | General and administrative
Reclassification detail
Reclassification before tax	266	449	732	1,395
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	1,789	(9,884)	3,783	(4,029)
Other comprehensive income before reclassifications	(12,888)	8,866	(14,882)	3,011
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Ending Balance	(11,099)	(1,018)	(11,099)	(1,018)
Reclassification detail
Reclassification after tax	$ 0	$ 0	$ 0	$ 0