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Acquisitions (EasyLink Services International Corporation) (Details) (USD $) | 3 Months Ended | 0 Months Ended | 3 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Jul. 02, 2012 EasyLink Services International Corporation [Member] | Sep. 30, 2012 EasyLink Services International Corporation [Member] | Sep. 30, 2011 EasyLink Services International Corporation [Member] | Jul. 02, 2012 EasyLink Services International Corporation [Member] Customer Assets [Member] | Jul. 02, 2012 EasyLink Services International Corporation [Member] Technology Assets [Member]
Business Acquisition, Cost of Acquired Entity [Abstract] |  |  |  |  |  |  |  |  |
Cash consideration paid |  |  | $ 342,272,000 |  |  |  |  |  |
Acquisition related costs |  |  |  | 749,000 |  |  |  |  |
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |  |  |  |  |  |  |
Current assets |  |  | 64,395,000 |  |  |  |  |  |
Cash acquired from acquisition |  |  | 26,941,000 |  |  |  |  |  |
Non-current assets |  |  | 37,626,000 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 126,600,000 | 70,500,000
Total liabilities assumed |  |  | (127,868,000) |  |  |  |  |  |
Total identifiable net assets |  |  | 171,253,000 |  |  |  |  |  |
Goodwill |  |  | 171,019,000 |  |  |  |  |  |
Fair value of total consideration transferred |  |  | 342,272,000 |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  | 0 |  |  |  |  |  |
Fair value of accounts receivable acquired |  |  | 26,600,000 |  |  |  |  |  |
Acquired accounts receivable, gross |  |  | 27,900,000 |  |  |  |  |  |
Acquired accounts receivable, expected to be uncollectible |  |  |  | 1,300,000 |  |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |
Actual revenues |  |  |  | 43,459,000 |  |  |  |  |
Actual net income |  |  |  | 593,000 | [1] |  |  |  |
Total revenues | 326,194,000 | 288,046,000 |  |  |  | 334,526,000 |  |  |
Net income | $ 19,429,000 | $ 34,986,000 |  |  |  | $ 48,628,000 | [2] |  |
[1] |
[2] | Included in pro forma net income are estimated amortization charges relating to the allocated values of intangible assets

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