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STOCK-BASED COMPENSATION (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Jun. 30, 2012
Stock Options Plans [Member]
Jun. 30, 2011
Stock Options Plans [Member]
Jun. 30, 2012
Stock Options Plans [Member]
Maximum [Member]
Jun. 30, 2012
Stock Options Plans [Member]
Directors [Member]
Jun. 30, 2012
Stock Options Plans [Member]
Officer and Key Employees [Member]
Jun. 30, 2012
Restricted Stock [Member]
Jun. 30, 2011
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Vesting Percentage 100% [Member]
Jun. 30, 2012
Restricted Stock [Member]
Vesting Percentage 67% [Member]
Jun. 30, 2012
Restricted Stock [Member]
Vesting Percentage 33% [Member]
Jun. 30, 2012
Restricted Stock [Member]
Vesting Percentage 0% [Member]
Jun. 30, 2012
Restricted Stock [Member]
Compounded Annual EPS Growth 15% or higher [Member]
Jun. 30, 2012
Restricted Stock [Member]
Compounded Annual EPS Growth 12%-14.99% [Member]
Jun. 30, 2012
Restricted Stock [Member]
Compounded Annual EPS Growth 10% - 11.99% [Member]
Jun. 30, 2012
Restricted Stock [Member]
Compounded Annual EPS Growth Below 10% [Member]
Jun. 30, 2012
Equity Classified Awards [Member]
Jun. 30, 2011
Equity Classified Awards [Member]
Nov. 07, 2011
Performance Based Awards [Member]
Restricted Stock [Member]
Executive Officers [Member]
Nov. 08, 2010
Performance Based Awards [Member]
Restricted Stock [Member]
Executive Officers [Member]
Apr. 30, 2012
Service Based Award [Member]
Restricted Stock [Member]
Independent Directors [Member]
Apr. 29, 2011
Service Based Award [Member]
Restricted Stock [Member]
Independent Directors [Member]
Nov. 07, 2011
Service Based Award [Member]
Restricted Stock [Member]
Officers [Member]
Nov. 08, 2010
Service Based Award [Member]
Restricted Stock [Member]
Officers [Member]
Nov. 07, 2011
Service Based Award [Member]
Restricted Stock [Member]
Officers [Member]
Stock Option Plans [Abstract]                                                      
Shares of authorized common stock reserved for issuance (in shares) 4,100,000                                                    
Award vesting date           10 years 1 year 5 years                                      
Number of shares available for grant (in shares)       1,459,138                                              
Options activity [Roll Forward]                                                      
Options outstanding, beginning of year (in shares)       1,041,500                                              
Granted (in shares)       0                                              
Exercised (in shares) (67,450)   (324,140) (67,450)                                              
Forfeited (in shares)       (6,400)                                              
Expired (in shares)       (300)                                              
Options outstanding, end of period (in shares)       967,350                                              
Options exercisable, end of period (in shares)       224,040                                              
Weighted Average Exercise Price [Roll Forward]                                                      
Options outstanding, beginning of year (in dollars per share)       $ 37.95                                              
Granted (in dollars per share)       $ 0                                              
Exercised (in dollars per share)       $ 27.35                                              
Forfeited (in dollars per share)       $ 48.85                                              
Expired (in dollars per share)       $ 43.04                                              
Options outstanding, end of period (in dollars per share)       $ 38.61                                              
Options exercisable, end of period (in dollars per share)       $ 27.58                                              
Stock Option Activity Additional Disclosures [Abstract]                                                      
Weighted-average remaining contractual term, Options outstanding, end of period       7 years 7 days                                              
Weighted-average remaining contractual terms, Options exercisable, end of period       3 years 10 months 20 days                                              
Aggregate intrinsic value, Options outstanding, end of period       $ 26,708,037                                              
Aggregate intrinsic value, Options exercisable, end of period       8,563,013                                              
Intrinsic value of options exercised       2,739,530 1,576,465                                            
Compensation Cost Not yet Recognized [Abstract]                                                      
Total unrecognized stock-based compensation expense related to non-vested stock options       10,900,000                                              
Weighted average period for recognition       3 years 7 months 6 days         1 year 10 months 24 days                                    
Restricted Stock [Abstract]                                                      
Awards granted (in shares)                 10,000                       11,139 15,871 10,000 10,000 15,077 29,080 24,200
Grant date fair value (in dollars per share)                 $ 66.51                       $ 67.7 $ 43.04 $ 66.51 $ 67.95 $ 67.7 $ 43.04 $ 67.7
Award vesting date                                         Apr. 30, 2014 Apr. 30, 2013          
Ratio of restricted stock vesting immediately (in hundredths)                 33.00%                                    
Ratio of restricted stock vesting after year one (in hundredths)                 33.00%                                    
Ratio of restricted stock vesting after year two (in hundredths)                 33.00%                                    
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                                      
Vesting Percentage (in hundredths)                             100.00% 67.00% 33.00% 0.00%                  
Compounded Annual EPS Growth, Minimum (in hundredths)                     15.00% 12.00% 10.00%                            
Compounded Annual EPS Growth, Maximum (in hundredths)                       14.99% 11.99% 10.00%                          
Unrecognized compensation cost related to unvested restricted stock awards granted                 2,400,000                                    
Weighted average period for recognition       3 years 7 months 6 days         1 year 10 months 24 days                                    
Summary of the status and changes in restricted stock [Roll Forward]                                                      
Outstanding at March 31, 2012 (in shares)                 93,999                                    
Granted during the period (in shares)                 10,000                       11,139 15,871 10,000 10,000 15,077 29,080 24,200
Vested during the period, net of cancellations (in shares)                 (25,413)                                    
Cancelled during the period (in shares)                 (7,746)                                    
Outstanding at June 30, 2012 (in shares)                 70,840                                    
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                                                      
Outstanding at March 31, 2012 (in dollars per share)                 $ 50.90                                    
Granted during the period (in dollars per share)                 $ 66.51                       $ 67.7 $ 43.04 $ 66.51 $ 67.95 $ 67.7 $ 43.04 $ 67.7
Vested during the period, net of cancellations (in dollars per share)                 $ 30.26                                    
Cancelled during the period (in dollars per share)                 $ 66.51                                    
Outstanding at June 30, 2012 (in dollars per share)                 $ 58.81                                    
Compensation related to stock option and restricted stock plans $ 1,850,728 $ 1,908,278   $ 1,172,910 $ 868,271       $ 1,193,003 $ 1,040,007                 $ 2,365,913 $ 1,908,278