Business Combinations - Additional Information (Details) - USD ($)			3 Months Ended			6 Months Ended
	May 24, 2016	Nov. 09, 2015	Jul. 01, 2016	Apr. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Recognized acquisition costs			$ 1,733,000		$ (475,000)	$ 1,979,000	$ (348,000)
Goodwill			108,253,000			$ 108,253,000		$ 103,456,000
Maximum
Business Acquisition [Line Items]
Estimated fair value measurement period from acquisition date						1 year
Reach Technology Inc.
Business Acquisition [Line Items]
Membership interests acquired	100.00%
Total purchase price	$ 9,400,000
Recognized acquisition costs						$ 200,000
Business combination estimated additional cash payment			$ 200,000			200,000
Goodwill	4,840,000
Intangible assets	4,037,000
Goodwill and intangible assets expected to be deductible for tax purposes	0
Revenues						900,000
Income (loss) from continuing operations before income taxes						$ (100,000)
Working capital adjustments	$ 185,000
Lincoln Laser Company
Business Acquisition [Line Items]
Total purchase price		$ 12,100,000
Working capital adjustments				$ 400,000