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Special Charges (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2012
Special Charges [Member]
Jun. 30, 2011
Special Charges [Member]
Jun. 30, 2010
Special Charges [Member]
Jun. 30, 2012
Recovery ARO [Member]
Jun. 30, 2011
Recovery ARO [Member]
Jun. 30, 2010
Recovery ARO [Member]
Jun. 30, 2012
Recovery Sublease [Member]
Jun. 30, 2012
Write-off of Debt Issuance Costs [Member]
Jun. 30, 2011
Charge Revised Sublease [Member]
Jun. 30, 2010
Write Down of Prepaid Royalties [Member]
Jun. 30, 2010
Write Down of Capital Assets [Member]
Jun. 30, 2010
Impairment of Intangible Assets [Member]
Jun. 30, 2010
Recovery of Negative Goodwill Related to Acquisition [Member]
Jun. 30, 2012
Fiscal 2012 Restructuring Plan [Member]
Jun. 30, 2012
Fiscal 2011 Restructuring Plan [Member]
Jun. 30, 2012
Fiscal 2010 Restructuring Plan [Member]
Jul. 02, 2012
Acquisition of EasyLink Services International Corporation [Member]
Special Charges [Member]
Restructuring Cost and Reserve [Line Items]                                        
Expected restructuring charges                                 $ 17,400,000      
Special charges recorded to date                                 16,900,000 9,700,000 38,400,000  
Acquisition-related costs 5,115,000 2,914,000 3,248,000 1,800,000 2,900,000 3,200,000                           700,000
Acquisition-integration related costs       3,300,000                                
Other charges $ 1,389,000 $ (482,000) $ (1,081,000)       $ 800,000 $ 1,000,000 $ 500,000 $ 500,000 $ 2,700,000 $ 500,000 $ 400,000 $ 500,000 $ 300,000 $ 1,700,000