Discontinued Operations - Additional Information (Details) (USD $)	3 Months Ended				12 Months Ended			1 Months Ended
	Dec. 31, 2014	Sep. 26, 2014	Sep. 27, 2013	Jun. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2014	Sep. 27, 2013	Oct. 31, 2012	May 31, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on sale of business, net of tax	$ (1,405,000)	$ (321,000)	$ (281,000)	$ (311,000)	$ (1,726,000)	$ (592,000)	$ 2,255,000
Scientific Lasers Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of assets and liabilities								6,500,000
Gain (Loss) on sale of business, net of tax					(1,700,000)
Sale proceeds held in escrow								1,500,000
Sale proceeds held in escrow, Period					2016-01
Discontinued operations write-down value					3,000,000
Excel Laser Technology Private Limited
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Discontinued operations write-down value					500,000
Laser Systems
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of assets and liabilities										7,000,000
Gain (Loss) on sale of business, net of tax							2,300,000		(200,000)
Settlement of closing working capital adjustments			(400,000)						(400,000)
Semiconductor Systems
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of assets and liabilities				8,000,000							9,700,000
Gain (Loss) on sale of business, net of tax				(300,000)		(400,000)			(300,000)
Settlement of closing working capital adjustments			1,700,000						1,700,000
Inventory provision							$ 1,900,000