Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Test Systems Segment [Member]
Jul. 02, 2011
Test Systems Segment [Member]
Jun. 30, 2012
Test Systems Segment [Member]
Jul. 02, 2011
Test Systems Segment [Member]
Nov. 30, 2011
Ballard [Member]
Jul. 30, 2012
Max-viz, Inc [Member]
Basis of Presentation (Textual) [Abstract]                    
Percentage of acquired stock                 100.00% 100.00%
Percentage of Revenue Recognized from Long Term Fixed Price Contracts         39.00% 68.00% 39.00% 83.00%    
Basis of Presentation (Additional Textual) [Abstract]                    
Research and development, design and related engineering $ 11.1 $ 8.8 $ 21.1 $ 17.1