Components of Gain (Loss) (Detail) (USD $)	3 Months Ended			1 Months Ended	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 31, 2012 Mainframe Technology	Mar. 29, 2013 DeltaNu	Mar. 30, 2013 DeltaNu
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds			$ 3,000,000	$ 500,000	$ 500,000
Assets sold:
Accounts receivable					147,000
Inventories			589,000		320,000
Other current assets					27,000
Property, plant and equipment			178,000		159,000
Trade name					90,000
Total assets sold					743,000
Liabilities divested:
Accounts payable					59,000
Other accrued expenses					6,000
Total liabilities divested					65,000
Transaction and other costs			26,000		30,000
Gain (Loss) on sale	$ (208,000)	$ 2,207,000	$ 2,207,000		$ (208,000)