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Acquisitions - Pro Forma Financial Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 24, 2012
Jun. 26, 2011
Jun. 24, 2012
Jun. 26, 2011
Feb. 11, 2011
Herley Industries, Inc.
Jul. 27, 2011
Integral Systems, Inc.
Business Acquisition, Pro Forma Information [Abstract]            
Pro forma revenues   $ 241.8   $ 484.6    
Pro forma net loss before tax   (5.8)   (38.8)    
Pro forma net loss   (6.6)   (38.6)    
Net income (loss) attributable to the registrant   (5.3)   (9.1)    
Basic and diluted pro forma loss per share   $ (0.19)   $ (1.13)    
Merger and acquisition expenses $ 1.5 $ 1.8 $ 2.4 $ 7.6    
Common stock issued in acquisition, shares         4.9 10.4