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Acquisitions (Acquisition Of weComm) (Details) (USD $)
 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Mar. 15, 2011
weComm LTD [Member]
Jun. 30, 2011
weComm LTD [Member]
Jun. 30, 2011
weComm LTD [Member]
Jun. 30, 2011
weComm LTD [Member]
Jun. 30, 2010
weComm LTD [Member]
Mar. 15, 2011
weComm LTD [Member]
Technology Assets [Member]
Mar. 15, 2011
weComm LTD [Member]
Customer Assets [Member]
Cash consideration paid       $ 20,461,000            
Cash Acquired from Acquisition       263,000            
Acquisition related costs         318,000 318,000 318,000      
Current assets       954,000            
Long-term assets       328,000            
Intangible assets                 5,000,000 300,000
Total liabilities assumed       (2,867,000)            
Total identifiable net assets       3,715,000            
Goodwill       16,746,000            
Fair value of total consideration transferred       20,461,000            
Amount held in escrow       2,100,000            
Consideration release period (in months)       12            
Fair value of accounts receivable acquired       190,000            
Acquired Accounts receivable, gross       250,000            
Acquired accounts receivable, expected uncollectible       60,000            
Total revenues 1,033,303,000 912,023,000 785,665,000   311,000          
Net income 123,203,000 89,212,000 56,938,000   (1,172,000) [1]          
Total revenues             1,035,175,000 915,870,000    
Net Income (loss)             120,913,000 88,425,000    
Amortization charges           400,000        
Total special charges (recoveries) $ 15,576,000 $ 42,008,000 $ 14,434,000     $ 170,000        
[1] Included within net loss for the period reported above are $0.4 million of estimated amortization charges relating to the allocated values of intangible assets and $0.17 million of restructuring charges included within Special charges (note 16).