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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Schedule Of Income Tax [Line Items]    
Effective income tax rate 16.60% 8.90%
Investment tax credit $ 36,300,000  
Unrecognized tax benefits of deferred tax asset offset by valuation allowance 8,800,000  
Net unrecognized tax benefit excluding portion offset by valuation allowance 140,100,000 149,500,000
Interest expense accrued 18,210,000 [1] 19,316,000 [1]
Penalties accrued 6,045,000 [1] 4,040,000 [1]
Increase (decrease) in gross unrecognized tax benefit in next 12 months (3,800,000)  
Number of years open to examination 10 years  
Taxes paid on cash distribution 400,000 0
Domestic Tax Authority [Member]
    
Schedule Of Income Tax [Line Items]    
Operating loss carryforwards 22,100,000  
Foreign Tax Authority [Member]
    
Schedule Of Income Tax [Line Items]    
Operating loss carryforwards 160,000,000  
Deferred tax assets, operating loss carryforwards, not subject to expiration 109,600,000  
EasyLink Services International Corporation [Member]
    
Schedule Of Income Tax [Line Items]    
Interest expense accrued 400,000  
Penalties accrued $ 1,900,000  
[1] *These balances have been included within "Long-term income taxes payable" within the Consolidated Balance Sheets.