Business Combinations - Additional Information (Details) (USD $)	0 Months Ended	9 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended	0 Months Ended
	Sep. 24, 2014	Sep. 26, 2014	Sep. 27, 2013	Dec. 31, 2013	Mar. 14, 2014 JADAK	Sep. 26, 2014 JADAK	Sep. 26, 2014 JADAK	Mar. 14, 2014 JADAK Maximum
Business Acquisition [Line Items]
Total purchase price, net of cash acquired		$ 88,238,000	$ 82,653,000		$ 93,656,000
Estimates and assumptions, measurement period								1 year
Goodwill, Period increase (decrease)	5,418,000	5,418,000				600,000
Goodwill		110,783,000		71,156,000	45,045,000
Intangible assets					40,250,000
Goodwill expected to be deductible for tax purposes					63,100,000
Sales						14,900,000	32,600,000
Income from continuing operations						$ 1,200,000	$ 2,300,000