Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	1 Months Ended		1 Months Ended	6 Months Ended		3 Months Ended
	Sep. 27, 2013	Sep. 27, 2013	Oct. 31, 2012 Laser Products	Sep. 27, 2013 Laser Products	May 30, 2013 Semiconductor Systems	Jun. 28, 2013 Semiconductor Systems	Sep. 27, 2013 Semiconductor Systems	Sep. 27, 2013 Semiconductor Systems Adjusted selling price
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on sale of business	$ (281,000)	$ (592,000)	$ 2,300,000			$ (300,000)
Sale of assets and liabilities		8,190,000	7,000,000		8,000,000			9,700,000
Settlement of closing working capital adjustments				$ 400,000			$ 1,700,000