Computation Of Earnings Per Common Share (Policy)	6 Months Ended
Computation Of Earnings Per Common Share (Policy)	Dec. 31, 2011
Computation Of Earnings Per Common Share [Abstract]
Computation Of Earnings Per Common Share	Basic earnings per common share ("EPS") is based upon net income available to common stockholders divided by the weighted-average number of common shares outstanding during the period. Diluted EPS reflects the effect of the assumed exercise of stock options and vesting of restricted shares, restricted stock units ("RSUs") and shares restricted on the same basis as underlying Cablevision restricted shares only in the periods in which such effect would have been dilutive.

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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