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SHARE-BASED COMPENSATION (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Weighted Average Grant-date Fair Value [Rollforward]          
Treasury stock (in shares) 4,854,739   4,854,739   4,749,680
Treasury stock $ 73,207,000   $ 73,207,000   $ 67,306,000
Compensation Expense [Abstract]          
Total share-based compensation expense 1,068,000 915,000 1,900,000 1,600,000  
Unrecognized compensation expense 7,100,000   7,100,000    
Unrecognized compensation expense, period for recognition (in months)     33 months    
Period over which employer contribution is vested 4 years        
Expenses for the plan 147,000 236,000 524,000 465,000  
Restricted Stock [Member]
         
Number of Shares [Rollforward]          
Nonvested (in shares)     246,048    
Granted (in shares)     85,635    
Vested (in shares)     (131,348)    
Nonvested (in shares) 200,335   200,335    
Weighted Average Grant-date Fair Value [Rollforward]          
Nonvested (in dollars per share)     $ 26.32    
Granted (in dollars per share)     $ 57.39    
Vested (in dollars per share)     $ 24.39    
Nonvested (in dollars per share) $ 41.03   $ 41.03    
Treasury stock (in shares) 42,073   42,073    
Treasury stock $ 2,500,000   $ 2,500,000    
Stock Options [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted to employees (in shares) 0 0 0 0  
Number of shares [Rollforward]          
Outstanding, beginning of period (in shares)   0 40,000    
Options exercised (in shares)     40,000    
Stock Options [Member] | Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercise price of stock options (in dollars per share)         $ 12.73
Stock Options [Member] | Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercise price of stock options (in dollars per share)         $ 15.25
2008 Director LTIP [Member] | Restricted Stock [Member]
         
Number of Shares [Rollforward]          
Granted (in shares)     8,520 7,831  
2012 Employee LTIP [Member] | Restricted Stock [Member]
         
Number of Shares [Rollforward]          
Granted (in shares)     77,115 96,590