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Acquisitions (Narrative) (Details) - USD ($)
3 Months Ended
Jan. 16, 2015
Jan. 02, 2015
Sep. 30, 2015
Sep. 30, 2014
Actuate Corporation [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 0      
Acquired receivables, fair value 23,400,000      
Acquired receivables, gross contractual amount 23,600,000      
Acquired receivables, estimated uncollectible 200,000      
Gain recognized remeasuring to fair value     $ 3,100,000  
Purchase consideration 331,956,000      
Payments to Acquire Businesses, Net of Cash Acquired     7,701,000 $ 0
Cash consideration paid $ 322,417,000      
Informative Graphics Corporation [Member]        
Business Acquisition [Line Items]        
Purchase consideration   $ 40,000,000    
Payments to Acquire Businesses, Net of Cash Acquired   38,700,000 $ 88,000 $ 0
Cash consideration paid   36,500,000    
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High   $ 3,500,000