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EMPLOYEE STOCK OPTION PLANS (Details) (USD $)
 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Range 76.74 to 152.98 [Member]
Jun. 30, 2012
Stock Options [Member]
Jun. 30, 2011
Stock Options [Member]
Jun. 30, 2012
Restricted Stock [Member]
Mar. 31, 2012
Restricted Stock [Member]
Jan. 15, 2012
Restricted Stock [Member]
Jun. 30, 2012
Phantom Stock Awards [Member]
Mar. 31, 2012
Phantom Stock Awards [Member]
Jan. 16, 2012
Phantom Stock Awards [Member]
Jul. 30, 2008
1999 Plan [Member]
Stock Options [Member]
Jul. 21, 2008
1999 Plan [Member]
Stock Options [Member]
Jul. 16, 2007
1999 Plan [Member]
Stock Options [Member]
Jul. 17, 2006
1999 Plan [Member]
Stock Options [Member]
May 15, 2006
1999 Plan [Member]
Stock Options [Member]
Jun. 30, 2012
1999 Plan [Member]
Stock Options [Member]
Mar. 31, 2012
1999 Plan [Member]
Stock Options [Member]
Jun. 30, 2012
1999 Plan [Member]
Stock Options [Member]
Minimum [Member]
Jun. 30, 2012
1999 Plan [Member]
Stock Options [Member]
Maximum [Member]
Jul. 18, 2011
2009 Plan [Member]
Jul. 19, 2010
2009 Plan [Member]
Mar. 22, 2010
2009 Plan [Member]
Oct. 19, 2009
2009 Plan [Member]
Jul. 18, 2011
2009 Plan [Member]
Stock Options [Member]
Jul. 19, 2010
2009 Plan [Member]
Stock Options [Member]
Mar. 22, 2010
2009 Plan [Member]
Stock Options [Member]
Oct. 19, 2009
2009 Plan [Member]
Stock Options [Member]
Jun. 30, 2012
2009 Plan [Member]
Stock Options [Member]
Mar. 31, 2012
2009 Plan [Member]
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                            
Number of shares authorized (in shares)               47,000     26,000                                   140,000  
Options available for grant (in shares)           36,350 37,350                                           60,250  
Expiration period from date of grant                                 10 years                          
Number of annual installments on exercise of awards                                     5 10                    
Compensation expense       $ 224,770 $ 244,650 $ 31,997                                                
Unrecognized compensation cost       1,774,717                                                    
Weighted average service period       2 years   4 years 6 months                                                
Options fair value assumptions [Abstract]                                                            
Weighted average fair value (in dollars per share)                       $ 29.93 $ 27.35 $ 41.78 $ 33.05 $ 31.28                 $ 33.07 $ 28.58 $ 32.56 $ 25.36    
Expected dividend yield (in hundredths)                       0.62% 0.67% 0.39% 0.61% 0.64%                 0.83% 0.91% 0.84% 1.04%    
Risk free interest rate (in hundredths)                       3.36% 3.41% 4.95% 5.04% 5.08%                 1.45% 1.73% 2.43% 2.36%    
Expected volatility (in hundredths)                       20.20% 20.20% 19.90% 21.20% 21.10%                 40.00% 37.50% 37.80% 37.60%    
Expected life (in years)                       5 years 5 years 5 years 7 years 7 years                 5 years 5 years 5 years 5 years    
Stock options [Roll Forward]                                                            
Balance at beginning of period (in shares)                                 95,000 96,500                     83,750 73,750
Granted (in shares)                                 0 0     10,000 15,000 20,000 38,750         0 10,000
Exercised (in shares)                                 16,090 (1,500)                     (18,800) 0
Canceled (in shares)                                 0 0                     (4,000) 0
Balance at end of period (in shares)       139,860                         78,910 95,000                     60,950 83,750
Weighted Average Exercise Price [Roll Forward]                                                            
Beginning of Period (in dollars per share)                                 $ 113.63 $ 114.78                     $ 85.75 $ 84.24
Granted (in dollars per share)                                 $ 0 $ 0     $ 96.92 $ 88.20 $ 95.79 $ 76.74         $ 0 $ 96.92
Exercised (in dollars per share)                                 $ 95.36 $ 65.70                     $ 78.87 $ 0
Cancelled (in dollars per share)                                 $ 0 $ 0                     $ 88.20 $ 0
Balance at end of period (in dollars per share)       $ 107.55                         $ 126.79 $ 113.63                     $ 87.71 $ 85.75
Weighted average remaining contractual term, outstanding 2 years                                                          
Weighted average remaining contractual term, exercisable 2 years 2 months 12 days                                                          
Aggregate intrinsic value, outstanding 4,306,842                                                          
Aggregate intrinsic value, exercisable 1,833,046                                                          
Stock Awards [Abstract]                                                            
Award vesting period           5 years                                                
Restricted stock available for issuance beginning balance (in shares)           37,350                                                
Less restricted stock forfeited during the quarter ended June 30, 2012: (in shares)           1,000                                                
Restricted stock available for issuance ending balance (in shares)           36,350 37,350                                           60,250  
Unrecognized compensation cost           650,826                                                
Number of shares                                                            
Number of shares unvested beginning (in shares)           9,650     26,000                                          
Number of shares granted (in shares)           0     0                                          
Number of shares vested (in shares)           0     0                                          
Number of shares forfeited or expired (in shares)           1,000     2,500                                          
Number of shares unvested ending (in shares)           8,650 9,650   23,500 26,000                                        
Weighted Average Fair Value Per Share                                                            
Weighted Average, Unvested Beginning (in dollars per share)           $ 83.60     $ 146.95                                          
Weighted Average, granted (in dollars per share)           $ 0     $ 0                                          
Weighted Average, vested (in dollars per share)           $ 0     $ 0                                          
Weighted Average, forfeited or expired (in dollars per share)           $ 83.60     $ 146.95                                          
Weighted Average, Unvested Ending (in dollars per share)           $ 83.60 $ 83.60   $ 146.95 $ 146.95                                        
Weighted Average Remaining Vesting Term (in Years) [Abstract]                                                            
Weighted Average Remaining Vesting Term Unvested Beginning           4 years 6 months 4 years 9 months 18 days   4 years 6 months 4 years 9 months 18 days                                        
Weighted Average Remaining Vesting Term , granted           0 years     0 years                                          
Weighted Average Remaining Vesting Term, vested           0 years     0 years                                          
Weighted Average Remaining Vesting Term, Forfeited or expired           0 years     0 years                                          
Weighted Average Remaining Vesting Term, Unvested Ending           4 years 6 months 4 years 9 months 18 days   4 years 6 months 4 years 9 months 18 days                                        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                                                            
Exercise price range, lower range limit (in dollars per share)     $ 76.74                                                      
Exercise price range, upper range limit (in dollars per share)     $ 152.98                                                      
Shares issued on exercise of stock options $ 34,890 $ 0                                                        
Options exercisable (in shares) 55,200 61,825                                                        
Weighted average exercise price (in dollars per share) $ 127.69 $ 113.04