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Income Taxes (Changes In Balance Of Gross Unrecognized Tax Benefits (Including Interest And Penalties)) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized Tax Benefits $ 156,281 $ 132,892
Increases on account of current year positions 5,736 5,279
Increases on account of prior year positions 22,017 [1] 65,994 [2]
Decreases due to settlements with tax authorities (5,138) (4,935)
Decreases due to lapses of statutes of limitations (29,993) (42,949)
Unrecognized Tax Benefits 148,903 156,281
Streamserve Inc [Member]
   
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Increases on account of prior year positions   400
EasyLink Services International Corporation [Member]
   
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Increases on account of prior year positions $ 8,800  
[1] Included in these balances as of June 30, 2013 are acquired balances of $8.8 million relating to the acquisition of EasyLink.
[2] Included in these balances as of June 30, 2012 are acquired balances of $0.4 million relating to the acquisition of Global 360.