Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Detail)

v2.4.0.8
Basis of Presentation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Contract
Segment
Sep. 29, 2012
Jul. 30, 2012
Schedule Of Accounting Policies [Line Items]          
Percentage of acquired stock         100.00%
Reportable segments     2    
Significant contracts     0    
Research and development, design and related engineering $ 12.4 $ 12.8 $ 38.6 $ 33.9  
Peco, Inc. [Member]
         
Schedule Of Accounting Policies [Line Items]          
Acquisition date     Jul. 18, 2013    
Test Systems Segment [Member]
         
Schedule Of Accounting Policies [Line Items]          
Percentage of revenue recognized from long term fixed price contracts 62.00% 32.00% 40.00% 37.00%