Costs Associated with Exit and Restructuring Activities - April 2014 Plan (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)	Jun. 28, 2015 USD ($) employee	Jun. 29, 2014 USD ($)
Restructuring charges
Restructuring and impairment charges	$ 2,335	$ 3,072	$ 3,148	$ 4,146
Cost of Goods
Restructuring charges
Restructuring charges	217	338	292	910
Operating Earnings
Restructuring charges
Restructuring and impairment charges	2,118	2,733	2,856	3,236
April 2014 Plan
Restructuring charges
Planned Costs	9,950		9,950
Actual costs incurred	5,564		5,564
April 2014 Plan | Cost of Goods
Restructuring charges
Restructuring charges	217	0	217	0
Planned Costs	4,050		4,050
Actual costs incurred	217		217
April 2014 Plan | Operating Earnings
Restructuring charges
Restructuring and impairment charges	1,516	$ 2,405	1,877	$ 2,405
Planned Costs	5,900		5,900
Actual costs incurred	5,347		$ 5,347
April 2014 Plan | Forecast
Restructuring charges
Elimination of workforce | employee			120
April 2014 Plan | Equipment relocation | Cost of Goods
Restructuring charges
Planned Costs	1,800		$ 1,800
Actual costs incurred	135		135
April 2014 Plan | Inventory write-down | Cost of Goods
Restructuring charges
Planned Costs	850		850
April 2014 Plan | Other charges | Cost of Goods
Restructuring charges
Planned Costs	1,400		1,400
Actual costs incurred	82		82
April 2014 Plan | Workforce reduction | Operating Earnings
Restructuring charges
Planned Costs	4,200		4,200
Actual costs incurred	3,888		3,888
April 2014 Plan | Other charges, including pension termination costs | Operating Earnings
Restructuring charges
Planned Costs	1,700		1,700
Actual costs incurred	1,459		1,459
April 2014 Plan Amendment
Restructuring charges
Planned Costs	4,250		4,250
April 2014 Plan Amendment | Plant shutdown
Restructuring charges
Planned Costs	1,300		1,300
April 2014 Plan Amendment | Equipment relocation
Restructuring charges
Planned Costs	$ 2,950		$ 2,950