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Acquisitions - SecureInfo Corporation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended
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. 30, 2012
SecureInfo Corporation
Dec. 25, 2011
SecureInfo Corporation
Nov. 15, 2011
SecureInfo Corporation
Dec. 26, 2010
SecureInfo Corporation
Nov. 15, 2011
SecureInfo Corporation
Earnout
Nov. 15, 2011
SecureInfo Corporation
Holdback escrow
Nov. 15, 2011
SecureInfo Corporation
Purchase price adjustment
Business Acquisition, Cost of Acquired Entity [Abstract]                                    
Purchase price                           $ 20.3        
Contingent consideration, fair value 2.1       7.6       2.1 7.6 5.8 0 1.5   0 1.5 1.8  
Closing working capital cutoff                                   2.2
Closing working capital, actual                                   2.1
Working capital adjustment                                   0.1
Business Combination, Acquired Receivables [Abstract]                                    
Acquired accounts receivable, gross                           2.9        
Revenues                       16.1 1.9          
Operating income (loss) $ (80.3) $ 14.1 $ 7.4 $ 9.1 $ 9.7 $ 9.7 $ 8.7 $ 1.4 $ (49.7) $ 29.5 $ 23.1 $ 0.6 $ 0.1