| 
           Fair Value (Details Textual) (USD $) 
        In Millions, unless otherwise specified  | 
        3 Months Ended | 
|---|---|
| 
           Mar. 30, 2013 
         | 
      |
| 
           Max-Viz, Inc [Member] 
         | 
        |
| Fair Value (Textual) [Abstract] | |
| Revenue growth target period | 3 years | 
| 
           Ballard [Member] 
         | 
        |
| Fair Value (Textual) [Abstract] | |
| Revenue growth target period | 4 years | 
| 
           Maximum [Member] | Max-Viz, Inc [Member] 
         | 
        |
| Fair Value (Textual) [Abstract] | |
| Contingent consideration on fair value liabilities | 8.0 | 
| 
           Maximum [Member] | Ballard [Member] 
         | 
        |
| Fair Value (Textual) [Abstract] | |
| Contingent consideration on fair value liabilities | 5.5 | 
| 
           Test Systems [Member] 
         | 
        |
| Fair Value (Textual) [Abstract] | |
| Total amortized intangible assets | 3.9 | 
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- Details 
          
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- Definition 
          Revenue growth target period. No definition available. 
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- Definition 
          Amount of potential cash payments that could result from the contingent consideration arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          This element represents the sum of all intangible assets having statutory or estimated useful lives. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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