Acquisitions and Purchase Accounting Estimated Fair Values of Assets Acquired and Liabilities Assumed for Nieco Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013	Sep. 08, 2014 as initially reported	Sep. 08, 2014 Scenario, Adjustment [Member]	Oct. 31, 2012 Nieco Corporation [Member]	Oct. 31, 2012 Nieco Corporation [Member] as initially reported	Oct. 31, 2012 Nieco Corporation [Member] Scenario, Adjustment [Member]
Business Acquisition [Line Items]
Cash			$ 345		$ 140	$ 140	$ 0
Current assets			3,767	0	4,011	4,011	0
Property, plant and equipment				0	268	268	0
Goodwill			11,255	55	15,382	18,855	(3,473)
Other intangibles					9,680	5,620	4,060
Current liabilities			2,296	55	(1,836)	(1,836)	0
Other non-current liabilities			(4,710)		(3,645)	(3,058)	(587)
Consideration paid at closing					24,000	24,000	0
Business Combination, Contingent Consideration	9,311	8,628	4,710	55	3,645	3,058	587
Net assets acquired and liabilities assumed					$ 27,645	$ 27,058	$ 587