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Acquisitions - Critical Infrastructure Business (Details) (Critical Infrastructure Business, USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Dec. 30, 2011
Sep. 29, 2013
Critical Infrastructure Business
   
Business Acquisition [Line Items]    
Consideration transferred $ 18.8  
Recurring revenues, percentage   15.00%
Business Combination, Acquired Receivables [Abstract]    
Acquired accounts receivable, gross 24.4  
Acquired accounts receivable, estimated uncollectible $ 1.0