Discontinued Operations and Divestitures - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		6 Months Ended
	Apr. 30, 2015	Jul. 31, 2014	Jul. 01, 2016	Jul. 03, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of transaction costs				$ 30,623
JK Lasers Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of transaction costs	$ 29,600
Pre-tax gain (loss) on sale of business	$ 19,600
Scientific Lasers Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of transaction costs		$ 6,500
Sale proceeds held in escrow		$ 1,500
Sale proceeds held in escrow, period			2016-01