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Guarantees And Contingencies (Details) (USD $)
 1 Months Ended
Jul. 31, 2009
Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]    
Total long-term debt obligations   $ 650,854,000
Long-term debt obligations due within one year   47,011,000
Long-term debt obligations due in second and third years   117,800,000
Long-term debt obligations due in fourth and fifth years   486,043,000
Long-term debt obligations due after fifth year   0
Total operating lease obligations   147,672,000 [1]
Operating lease obligations due within one year   24,679,000 [1]
Operating lease obligations due in second and third years   52,464,000 [1]
Operating lease obligations due in fourth and fifth years   32,993,000 [1]
Operating lease obligations due after fifth year   37,536,000 [1]
Total purchase obligations   6,743,000
Purchase obligations due within one year   4,257,000
Purchase obligations due in second and third years   2,387,000
Purchase obligations due in fourth and fifth years   99,000
Purchase obligations due after fifth year   0
Total obligations   805,269,000
Total obligations due within one year   75,947,000
Total obligations due in second and third years   172,651,000
Total obligations due in fourth and fifth years   519,135,000
Total obligations due after fifth year   37,536,000
Non-cancelable sublease income   3,100,000
EasyLink Services International Corporation [Member]
    
Loss Contingencies [Line Items]    
Estimate of possible assessment   11,000,000
Amount assessed for sales tax, interest, and penalties $ 500,000  
[1] Net of $3.1 million of sublease income to be received from properties which we have subleased to third parties.