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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 01, 2011
Nov. 30, 2011
Dec. 30, 2012
Sep. 30, 2012
Jun. 24, 2012
Mar. 25, 2012
Dec. 25, 2011
Sep. 25, 2011
Jun. 26, 2011
Mar. 27, 2011
Dec. 30, 2012
Dec. 25, 2011
Dec. 26, 2010
Dec. 25, 2011
Certain useful lives of acquired intangibles
Minimum
Dec. 25, 2011
Certain useful lives of acquired intangibles
Maximum
Mar. 25, 2011
Herley
Feb. 28, 2011
Herley
Dec. 30, 2012
Herley
Dec. 25, 2011
Herley
Jul. 27, 2011
Integral
Jul. 31, 2011
Integral
Dec. 30, 2012
Integral
Dec. 25, 2011
Integral
Quarterly Financial Information Disclosure [Abstract]                                              
Revenues     $ 263.6 $ 276.3 $ 219.8 $ 209.5 $ 213.4 $ 206.6 $ 171.1 $ 122.8 $ 969.2 $ 713.9 $ 408.5                    
Gross profit     68.0 74.1 57.7 57.4 59.4 59.0 45.4 27.4 257.2 191.2 84.3                    
Operating income (loss) from continuing operations     (80.3) 14.1 7.4 9.1 9.7 9.7 8.7 1.4 (49.7) 29.5 23.1         31.4 12.7     10.8 7.1
Provision (benefit) for income taxes from continuing operations     (5.4) 1.3 6.6 (4.1) 0.6 1.6 0.9 (1.2) (1.6) 1.9 (12.7)                    
Net income (loss)     (90.0) (4.2) (17.2) (3.0) (8.6) (6.9) (5.2) (3.5) (114.4) (24.2) 14.5                    
Net loss per common share:                                              
Basic (in dollars per share)     $ (1.59) $ (0.07) $ (0.41) $ (0.09) $ (0.25) $ (0.22) $ (0.22) $ (0.17) $ (2.44) $ (0.88) $ 0.87                    
Diluted (in dollars per share)     $ (1.59) $ (0.07) $ (0.41) $ (0.09) $ (0.25) $ (0.22) $ (0.22) $ (0.17) $ (2.44) $ (0.88) $ 0.86                    
Business Acquisition [Line Items]                                              
Impairment of goodwill and intangible assets                     96.6 0 0                    
Expenses related to acquisitions             1.2 3.7 1.8 5.8   12.5 3.1                    
Expense (benefit) related to acquisitions     (2.7) 0.3 1.5 0.9         (2.7) 12.5 3.1                    
Amortization of purchased intangibles     $ 11.5 $ 13.0 $ 8.9 $ 10.5 $ 13.5 $ 11.9 $ 9.2 $ 3.4                          
Useful lives of purchased intangibles                           10 months 16 months                
Common stock issued for acquisitions (in shares)                               0.8 4.9     10.4 10.4    
Buyback of shares (in shares) 2.0 2.0