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EQUITY-BASED INCENTIVE AWARDS (Details 2) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Restricted Stock Units
Nov. 30, 2010
Restricted Stock Units 1
Mar. 31, 2013
Restricted Stock Units 1
Nov. 22, 2010
Restricted Stock Units 1
Oct. 31, 2011
Restricted Stock Units 2
Mar. 31, 2013
Restricted Stock Units 2
Oct. 26, 2011
Restricted Stock Units 2
Oct. 31, 2012
Restricted Stock Units 3
Mar. 31, 2013
Restricted Stock Units 3
Oct. 23, 2012
Restricted Stock Units 3
Restricted stock units                            
Service period           36 months     36 months     36 months    
Estimated fair value of award at grant date               $ 864,000     $ 855,000     $ 935,000
Award outstanding at the end of the period (in shares)         29,600   4,000     10,600     15,000  
Fair value of nonvested awards at the end of the period             308,000     817,000     1,157,000  
Vested as of the balance sheet date (in shares)             8,000     5,300        
Direct cost to the recipients of the restricted stock units         0                  
Number of Shares                            
Nonvested restricted stock units at the beginning of the period (in shares)         36,700   4,000     10,600     15,000  
Granted (in shares)         15,000 12,000     15,900     15,000    
Vested (in shares)         (22,100)                  
Nonvested restricted stock units at the end of the period (in shares)         29,600   4,000     10,600     15,000  
Weighted Average Fair Value                            
Nonvested restricted stock units at the beginning of the period (in dollars per share)         $ 65.00                  
Granted (in dollars per share)         $ 62.33                  
Vested (in dollars per share)         $ 62.86                  
Nonvested restricted stock units at the end of the period (in dollars per share)         $ 64.45                  
All Equity-Based Awards (stock options and restricted stock units)                            
Compensation expense related to the amortization of all equity - based compensation awards 300,000 400,000 700,000 700,000                    
Total unamortized compensation expense $ 2,000,000   $ 2,000,000