Investment in CyOptics, Inc.	9 Months Ended
Investment in CyOptics, Inc.	Sep. 29, 2012
Cost-method Investments, Realized Gain (Loss), Alternative [Abstract]
Investment in CyOptics, Inc.	Investment in CyOptics, Inc. In previous years, the Company made a number of investments in small, privately held technology companies in which the Company has held less than 20% of the capital stock or held notes receivable. As a result of the sale of the Company's former optoelectronics operations, the Company received as partial consideration $4,500 of preferred stock and an unsecured promissory note from CyOptics Inc. ("CyOptics") for $5,633. In years prior to 2011, the carrying amount of the CyOptics investment was fully impaired and written down to $0. During the nine months ended September 29, 2012, the remaining amount due on the promissory note was settled in full and the preferred stock was sold in exchange for a total liquidation payment of $6,957. The transaction was recorded as a gain/recovery of investment in the statement of operations and in the operating activities section of the statement of cash flows. The proceeds from the liquidation were received in cash during the nine months ended September 29, 2012 and are included in the investing activities section of the statement of cash flows.

The entire disclosure for investments accounted for under the cost-method. The carrying amount of such investments may be adjusted, for example, distributions in excess of cost (return of capital) or for other-than-temporary impairments. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries in which the entity does not have the ability to exercise significant influence.

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