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STOCK-BASED COMPENSATION (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2012
Performance Share Units
Jun. 30, 2012
Performance Share Units
Sep. 30, 2012
Performance Share Units
Common Class A
Sep. 30, 2012
Restricted Stock Units
Sep. 30, 2012
Restricted Stock Units
RSU grants scheduled to vest on October 31, 2013
Sep. 30, 2012
Restricted Stock Units
RSU grants scheduled to vest on October 31, 2014
Sep. 30, 2012
Restricted Stock Units
RSU grants scheduled to vest on June 30, 2015
Sep. 30, 2012
Restricted Stock Units
RSU grants scheduled to vest on September 4, 2015
Sep. 30, 2012
Restricted Stock Units
RSU grants scheduled to vest on November 2, 2015
Sep. 30, 2012
Restricted Stock Units
RSU grants scheduled to vest on June 30, 2016
Sep. 30, 2012
Restricted Stock Units
RSU grants scheduled to vest on June 30, 2017
Sep. 30, 2012
Performance share units based on total stockholder return
Sep. 30, 2012
Performance share units based on total stockholder return
Performance share units based on total stockholders return vesting (contractual term 33 months)
Sep. 30, 2012
Performance share units based on total stockholder return
Performance share units based on total stockholders return vesting (contractual term 45 months)
Sep. 30, 2012
Performance share units based on total stockholder return
Performance share units based on total stockholders return vesting (contractual term 57 months)
Sep. 30, 2012
Performance share units based on total stockholder return
Common Class A
Sep. 30, 2012
Performance share units based on total stockholder return
Common Class A
Maximum
Sep. 30, 2012
Market Share Unit
Sep. 30, 2012
Share Units
Jun. 30, 2012
Share Units
Sep. 30, 2012
Cash Units
Sep. 30, 2011
Cash Units
Share-based Compensation Arrangement by Share-based Payment Award                                            
Class A Common Stock issued for Performance Share Units (in shares)     495,900                                      
Vested (in shares)   330,600   79,600                                    
Other Equity Compensation Plans                                            
Nonvested at the beginning of the period (in shares) 625,900     2,392,900                                    
Granted (in shares) 250,800     1,279,700                                    
Vested (in shares)   (330,600)   (79,600)                                    
Forfeited (in shares)       (28,600)                                    
Nonvested at the end of the period (in shares) 876,700 625,900   3,564,400                                    
RSU grants scheduled to vest (in shares)         635,400 335,400 32,600 4,900 206,600 32,600 32,600                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value                                            
Nonvested at the beginning of the period (in dollars per share) $ 37.31     $ 38.22                                    
Granted (in dollars per share) $ 59.08     $ 59.25                                    
Vested (in dollars per share)       $ 16.75                                    
Forfeited (in dollars per share)       $ 41.97                                    
Nonvested at the end of the period (in dollars per share) $ 43.54 $ 37.31   $ 46.22                           $ 10,600,000.00        
Grant date fair value of performance share units (in USD)                       $ 11.0                    
Target payout for performance share units in Class A Common Stock (in shares)                               162,760 260,416          
Weighted-average expected option life                         33 months 45 months 57 months              
Number of shares outstanding                                   1        
Method used for estimating grant date fair value                       lattice model with a Monte Carlo           lattice model with a Monte Carlo        
Contractual life                                   41 months        
Weighted-average expected volatility (as a percent)                       32.00%           29.00%        
Weighted-average risk-free interest rate (as a percent)                         0.30% 0.50% 0.70%     1.60%        
Dividend yield (as a percent)                       1.00%           1.00%        
Non-Employee Director Plans                                            
Outstanding at the beginning of the period (in shares)                                     73,700 73,700    
Outstanding at the end of the period (in shares)                                     73,700 73,700    
Weighted-Average Grant Date Fair Value Per Share                                            
Outstanding at the beginning of the period (in dollars per share)                                     $ 28.69 $ 28.69    
Outstanding at the end of the period (in dollars per share)                                     $ 28.69 $ 28.69    
Non-employee Director Deferred Cash Compensation, Cash Payout Shares                                            
Deferred compensation expense (in dollars)                                         1.6  
Reduction of compensation expense to reflect additional deferrals and the change in the market value (in dollars)                                           $ 1.5