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Special Charges (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]        
Acquisition-related costs $ 808,000 $ 1,081,000 $ 1,612,000 $ 1,896,000
Other charges 743,000 2,700,000 1,348,000 1,345,000
Special Charges [Member]
        
Restructuring Cost and Reserve [Line Items]        
Acquisition-related costs   300,000   1,100,000
Acquisition-integration related costs 300,000 800,000 400,000 800,000
Recovery ARO [Member]
        
Restructuring Cost and Reserve [Line Items]        
Other charges 1,000,000     800,000
Charge Revised Sublease [Member]
        
Restructuring Cost and Reserve [Line Items]        
Other charges (300,000)   600,000  
Recovery Sublease [Member]
        
Restructuring Cost and Reserve [Line Items]        
Other charges       500,000
Write-off of Debt Issuance Costs [Member]
        
Restructuring Cost and Reserve [Line Items]        
Other charges   2,700,000    
Fiscal 2013 Restructuring Plan [Member]
        
Restructuring Cost and Reserve [Line Items]        
Expected total restructuring costs     15,000,000  
Special charges recorded to date     8,300,000  
Fiscal 2012 Restructuring Plan [Member]
        
Restructuring Cost and Reserve [Line Items]        
Special charges recorded to date     17,900,000  
Acquisition of EasyLink Services International Corporation [Member] | Special Charges [Member]
        
Restructuring Cost and Reserve [Line Items]        
Acquisition-related costs $ 500,000   $ 1,200,000