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EQUITY-BASED INCENTIVE AWARDS (Details 2) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2012
Restricted Stock Units
Nov. 30, 2010
Restricted Stock Units 1
Oct. 26, 2012
Restricted Stock Units 1
Jun. 30, 2012
Restricted Stock Units 1
Nov. 22, 2010
Restricted Stock Units 1
Nov. 30, 2010
Restricted Stock Units 2
Nov. 22, 2013
Restricted Stock Units 2
Nov. 22, 2012
Restricted Stock Units 2
Jun. 30, 2012
Restricted Stock Units 2
Nov. 22, 2010
Restricted Stock Units 2
Oct. 31, 2011
Restricted Stock Units 3
Oct. 25, 2014
Restricted Stock Units 3
Oct. 25, 2013
Restricted Stock Units 3
Oct. 25, 2012
Restricted Stock Units 3
Jun. 30, 2012
Restricted Stock Units 3
Oct. 26, 2011
Restricted Stock Units 3
Restricted stock units                                    
Service period (in months)       24 months       36 months         36 months          
Estimated fair value of award at grant date             $ 2,765,000         $ 864,000           $ 855,000
Award outstanding at the end of the period     36,700     12,800         8,000           15,900  
Fair value of nonvested awards at the end of the period           719,000         450,000           894,000  
Units scheduled to vest         12,800       4,000 4,000       5,300 5,300 5,300    
Number of Shares                                    
Nonvested restricted stock units at the beginning of the period (in shares)     37,600     12,800         8,000           15,900  
Granted (in shares)     15,900 38,400       12,000         15,900          
Vested (in shares)     (16,800)                              
Vested as of the balance sheet date (in shares)           25,600         4,000              
Nonvested restricted stock units at the end of the period (in shares)     36,700     12,800         8,000           15,900  
Weighted Average Fair Value                                    
Nonvested restricted stock units at the beginning of the period (in dollars per share)     $ 57.00                              
Granted (in dollars per share)     $ 53.80                              
Vested (in dollars per share)     $ 56.58                              
Nonvested restricted stock units at the end of the period (in dollars per share)     $ 64.40                              
All Equity-Based Awards (stock options and restricted stock units)                                    
Compensation expense related to the amortization of all equity-based compensation awards 300,000 900,000                                
Total unamortized compensation expense $ 1,400,000 $ 1,400,000