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STOCK-BASED COMPENSATION (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Dec. 31, 2012
Stock Options Plans [Member]
Dec. 31, 2011
Stock Options Plans [Member]
Dec. 31, 2012
Stock Options Plans [Member]
Dec. 31, 2011
Stock Options Plans [Member]
Nov. 30, 2011
Restricted Stock [Member]
Nov. 30, 2010
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
15% or higher [Member]
Dec. 31, 2011
Restricted Stock [Member]
15% or higher [Member]
Dec. 31, 2012
Restricted Stock [Member]
12% - 14.99% [Member]
Dec. 31, 2011
Restricted Stock [Member]
12% - 14.99% [Member]
Dec. 31, 2012
Restricted Stock [Member]
10% - 11.99% [Member]
Dec. 31, 2011
Restricted Stock [Member]
10% - 11.99% [Member]
Dec. 31, 2012
Restricted Stock [Member]
Below 10% [Member]
Dec. 31, 2011
Restricted Stock [Member]
Below 10% [Member]
Dec. 31, 2012
Restricted Stock [Member]
Vesting Percentage 100% [Member]
Dec. 31, 2011
Restricted Stock [Member]
Vesting Percentage 100% [Member]
Dec. 31, 2012
Restricted Stock [Member]
Vesting Percentage 67% [Member]
Dec. 31, 2011
Restricted Stock [Member]
Vesting Percentage 67% [Member]
Dec. 31, 2012
Restricted Stock [Member]
Vesting Percentage 33% [Member]
Dec. 31, 2011
Restricted Stock [Member]
Vesting Percentage 33% [Member]
Dec. 31, 2012
Restricted Stock [Member]
Vesting Percentage 0% [Member]
Dec. 31, 2011
Restricted Stock [Member]
Vesting Percentage 0% [Member]
Nov. 30, 2010
Restricted Stock [Member]
Service Based Award [Member]
Officers [Member]
Dec. 31, 2011
Restricted Stock [Member]
Service Based Award [Member]
Officers [Member]
Nov. 30, 2010
Restricted Stock [Member]
Service Based Award [Member]
Executive Officers [Member]
Dec. 31, 2011
Restricted Stock [Member]
Service Based Award [Member]
Executive Officers [Member]
Apr. 30, 2012
Restricted Stock [Member]
Service Based Award [Member]
Independent Directors [Member]
Apr. 30, 2011
Restricted Stock [Member]
Service Based Award [Member]
Independent Directors [Member]
Dec. 07, 2012
Restricted Stock [Member]
Performance Based Awards [Member]
Directors and Officers [Member]
Dec. 31, 2012
Restricted Stock [Member]
Performance Based Awards [Member]
Directors and Officers [Member]
Dec. 31, 2012
Restricted Stock [Member]
Performance Based Awards [Member]
Officer and Key Employees [Member]
Dec. 31, 2012
Restricted Stock [Member]
Performance Based Awards [Member]
Officers [Member]
Nov. 30, 2011
Restricted Stock [Member]
Performance Based Awards [Member]
Executive Officers [Member]
Nov. 30, 2010
Restricted Stock [Member]
Performance Based Awards [Member]
Executive Officers [Member]
Dec. 31, 2012
Restricted Stock [Member]
Performance Based Awards [Member]
Executive Officers [Member]
Dec. 31, 2011
Restricted Stock [Member]
Performance Based Awards [Member]
Executive Officers [Member]
Dec. 31, 2012
Restricted Stock [Member]
EPS Target [Member]
Performance Based Awards [Member]
Dec. 31, 2012
Restricted Stock [Member]
EPS Target [Member]
$10.29 EPS [Member]
Dec. 31, 2012
Restricted Stock [Member]
EPS Target [Member]
$9.76 EPS [Member]
Dec. 31, 2012
Restricted Stock [Member]
EPS Target [Member]
$9.26 EPS [Member]
Dec. 31, 2012
Restricted Stock [Member]
EPS Target [Member]
Below $9.26 EPS [Member]
Dec. 31, 2012
Restricted Stock [Member]
Trailing Four Quarter EPS Target [Member]
Performance Based Awards [Member]
Dec. 31, 2012
Restricted Stock [Member]
Trailing Four Quarter EPS Target [Member]
$13.00 [Member]
Dec. 31, 2012
Restricted Stock [Member]
Trailing Four Quarter EPS Target [Member]
$14.50 [Member]
Dec. 31, 2012
Restricted Stock [Member]
Trailing Four Quarter EPS Target [Member]
$16.00 [Member]
Dec. 31, 2012
Restricted Stock [Member]
Trailing Four Quarter EPS Target [Member]
$18.00 [Member]
Dec. 31, 2012
Equity Classified Awards [Member]
Dec. 31, 2011
Equity Classified Awards [Member]
Dec. 31, 2012
Equity Classified Awards [Member]
Dec. 31, 2011
Equity Classified Awards [Member]
Dec. 31, 2012
Maximum [Member]
Stock Options Plans [Member]
Dec. 31, 2012
Maximum [Member]
Stock Options Plans [Member]
Officer and Key Employees [Member]
Dec. 31, 2012
Maximum [Member]
Restricted Stock [Member]
EPS Target [Member]
Below $9.26 EPS [Member]
Stock Option Plans [Abstract]                                                                                                                            
Shares of authorized common stock reserved for issuance (in shares)           4,100,000   4,100,000                                                                                                            
Vesting period 5 years 5 years 5 years 5 years                                                                                                               10 years 5 years  
Number of shares available for grant (in shares)           478,088   478,088                                                                                                            
Weighted-average fair value at the grant date $ 36.04 $ 36.15 $ 36.04 $ 36.15                                                                                                                    
Options Activity [Roll Forward]                                                                                                                            
Options outstanding, beginning of year (in shares)               1,041,500                                                                                                            
Granted (in shares)               556,000                                                                                                            
Exercised (in shares)     (249,035)   (324,140)     (249,035)                                                                                                            
Forfeited (in shares)               (10,850)                                                                                                            
Expired (in shares)               (300)                                                                                                            
Options outstanding, end of period (in shares)           1,337,315   1,337,315                                                                                                            
Options exercisable, end of period (in shares)           291,055   291,055                                                                                                            
Weighted Average Exercise Price [Roll Forward]                                                                                                                            
Options outstanding, beginning of year (in dollars per share)               $ 37.95                                                                                                            
Granted (in dollars per share)               $ 71.40                                                                                                            
Exercised (in dollars per share)               $ 28.59                                                                                                            
Forfeited (in dollars per share)               $ 45.82                                                                                                            
Expired (in dollars per share)               $ 43.04                                                                                                            
Options outstanding, end of period (in dollars per share)           $ 53.53   $ 53.53                                                                                                            
Options exercisable, end of period (in dollars per share)           $ 33.35   $ 33.35                                                                                                            
Stock Option Activity Additional Disclosures [Abstract]                                                                                                                            
Weighted-average remaining contractual term, Options outstanding, end of period               8 years 0 months 29 days                                                                                                            
Weighted-average remaining contractual terms, Options exercisable, end of period               5 years 1 month 6 days                                                                                                            
Aggregate intrinsic value, Options outstanding, end of period           $ 28,118,105   $ 28,118,105                                                                                                            
Aggregate intrinsic value, Options exercisable, end of period           11,993,350   11,993,350                                                                                                            
Intrinsic value of options exercised           5,377,474 7,051,893 10,327,163 9,452,314                                                                                                          
Compensation Cost Not yet Recognized [Abstract]                                                                                                                            
Total unrecognized stock-based compensation expense related to non-vested stock options           26,900,000   26,900,000                                                                                                            
Weighted average period for recognition               4 years 5 months 5 days           3 years 7 months 21 days                                                                                                
Restricted Stock [Abstract]                                                                                                                            
Awards granted (in shares)     439,500   60,416                 439,500                                                                                                
Grant date fair value (in dollars per share)                           $ 73.89                                     $ 67.70 $ 43.04 $ 67.70 $ 66.51 $ 67.95 $ 74.08 $ 74.08   $ 73.41   $ 43.04   $ 67.70                                  
Award vesting date                                                                                   Apr. 30, 2014 Apr. 30, 2013 Apr. 30, 2015                                    
Ratio of restricted stock vesting immediately (in hundredths)                   33.333% 33.333%                                                                                                      
Ratio of restricted stock vesting after year one (in hundredths)                   33.333% 33.333%                                                                                                      
Ratio of restricted stock vesting after year two (in hundredths)                   33.333% 33.333%                                                                                                      
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                                                                                                            
Vesting Percentage (in hundredths)                               100.00% 100.00% 67.00% 67.00% 33.00% 33.00% 0.00% 0.00%                                               100.00% 67.00% 33.00% 0.00%   25.00% 25.00% 25.00% 25.00%              
EPS Target                                                                                             10.29 9.76 9.26     13 14.50 16 18             9.26
Compounded Annual EPS Growth, Minimum (in hundredths)                                               15.00% 15.00% 12.00% 12.00% 10.00% 10.00%                                                                  
Compounded Annual EPS Growth, Maximum (in hundredths)                                                   14.99% 14.99% 11.99% 11.99% 10.00% 10.00%                                                              
Unrecognized compensation cost related to unvested restricted stock awards granted                       32,400,000   32,400,000                                                                                                
Weighted average period for recognition               4 years 5 months 5 days           3 years 7 months 21 days                                                                                                
Summary of the status and changes in restricted stock [Roll Forward]                                                                                                                            
Outstanding at March 31, 2012 (in shares)                           93,999                                                                                                
Awards granted (in shares)                                                               29,080 24,200   15,077 10,000 10,000 69,600 350,900 1,200 7,800   15,871   11,139 70,800         358,700                      
Vested during the period, net of cancellations (in shares)                           (41,285)                                                                                                
Cancelled during the period (in shares)                           (14,758)                                                                                                
Outstanding at June 30, 2012 (in shares)                       477,456   477,456                                                                                                
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                                                                                                                            
Outstanding at March 31, 2012 (in dollars per share)                           $ 50.90                                                                                                
Grant date fair value (in dollars per share)                           $ 73.89                                     $ 67.70 $ 43.04 $ 67.70 $ 66.51 $ 67.95 $ 74.08 $ 74.08   $ 73.41   $ 43.04   $ 67.70                                  
Vested during the period, net of cancellations (in dollars per share)                           $ 46.30                                                                                                
Cancelled during the period (in dollars per share)                           $ 41.51                                                                                                
Outstanding at June 30, 2012 (in dollars per share)                       $ 72.61   $ 72.61                                                                                                
Compensation related to stock option and restricted stock plans     $ 6,735,222 $ 4,897,230   $ 2,370,084 $ 2,050,346 $ 4,863,099 $ 3,716,308     $ 1,012,904 $ 848,506 $ 2,848,405 $ 2,296,183                                                                                 $ 3,382,988 $ 2,898,852 $ 7,711,504 $ 6,012,491