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Acquisitions (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Oct. 31, 2011
System Solutions Australia Pty Limited (MessageManager) [Member]
Dec. 31, 2011
System Solutions Australia Pty Limited (MessageManager) [Member]
Dec. 31, 2011
Operitel Corporation [Member]
Dec. 31, 2011
Operitel Corporation [Member]
Sep. 01, 2011
Operitel Corporation [Member]
Jul. 13, 2011
Global 360 Holding Corporation [Member]
Dec. 31, 2011
Global 360 Holding Corporation [Member]
Dec. 31, 2011
Global 360 Holding Corporation [Member]
Business Acquisition [Line Items]                        
Total consideration paid         $ 3,300,000       $ 7,200,000 $ 256,597,000    
Cash consideration paid         2,700,000       6,300,000 256,597,000    
Cash acquired from acquisition                     2,100,000  
Cash acquired from acquisition         1,200,000         10,944,000    
Amount held in escrow                 400,000 34,200,000    
Unpaid consideration, held back         600,000   100,000 100,000 800,000      
Acquisition related costs (included in Special charges in the Condensed Consolidated Statements of Income) 1,081,000 1,128,000 1,896,000 1,128,000   60,000    90,000     200,000 924,000
Acquisition-related costs 1,081,000 1,128,000 1,896,000 1,128,000   60,000    90,000     200,000 924,000
Fair value of current assets, accounts receivable acquired                   11,900,000    
Acquired accounts receivable, gross amount receivable                   12,800,000    
Acquired accounts receivable, expected to be uncollectible                     $ 900,000 $ 900,000