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EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION, Restricted Stock Units (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Time-Based Restricted Stock Units [Member]
       
Restricted Stock Unit Activity [Roll Forward]        
Nonvested, beginning of period (in shares)     1,120,000  
Granted (in shares)     180,000 [1]  
Vested (in shares)     (247,000) [2]  
Canceled or forfeited (in shares)     (18,000)  
Nonvested, end of period (in shares) 1,035,000   1,035,000  
Total intrinsic value $ 1,800,000 $ 533,000 $ 8,700,000 $ 5,900,000
Total grant date fair value 1,100,000 506,000 5,800,000 4,500,000
Restricted Stock Units Activity (in dollars per share) [Roll Forward]        
Nonvested, beginning of period (in dollars per share)     $ 24.06 [3]  
Granted (in dollars per share)     $ 35.83 [1],[3]  
Vested (in dollars per share)     $ 23.41 [2],[3]  
Canceled or forfeited (in dollars per share)     $ 25.93 [3]  
Nonvested, end of period (in dollars per share) $ 26.23 [3]   $ 26.23 [3]  
Unrecognized compensation expense 22,000,000   22,000,000  
Weighted average service period for recognition of unrecognized compensation costs     2 years 1 month 6 days  
Time-Based Restricted Stock Units [Member] | Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Time-based vesting schedules     Four-year time-based vesting as follows: five percent vesting after the first year; additional ten percent after the second year; additional 15 percent after the third year; and the remaining 70 percent after the fourth year of continuous employment with the Company.  
Time-Based Restricted Stock Units [Member] | Non-employee directors [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Time-based vesting schedules     100 percent vesting after one year of continuous service to the Company.  
Performance-Based Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum shares authorized for issuance (in shares) 84,000   84,000  
Percentage of restricted stock unit awards deemed granted each year (in hundredths)     25.00%  
Percentage of restricted stock unit awards approved, but deemed not granted (in hundredths) 75.00%   75.00%  
Number of performance period     4  
Duration of each performance period     1 year  
Restricted Stock Unit Activity [Roll Forward]        
Nonvested, beginning of period (in shares)     0  
Granted (in shares)     21,000 [1]  
Vested (in shares)     0 [2]  
Canceled or forfeited (in shares)     0  
Nonvested, end of period (in shares) 21,000   21,000  
Restricted Stock Units Activity (in dollars per share) [Roll Forward]        
Nonvested, beginning of period (in dollars per share)     $ 0 [3]  
Granted (in dollars per share)     $ 35.62 [1],[3]  
Vested (in dollars per share)     $ 0 [2],[3]  
Canceled or forfeited (in dollars per share)     $ 0 [3]  
Nonvested, end of period (in dollars per share) $ 35.62 [3]   $ 35.62 [3]  
Aggregate estimated grant date fair value 752,000   752,000  
Unrecognized compensation expense $ 360,000   $ 360,000  
Weighted average service period for recognition of unrecognized compensation costs     7 months 6 days  
[1] The shares granted for restricted stock unit awards (performance vesting) do not include the awards approved by the Board of Directors during the period that have not been granted in accordance with ASC 718-10-55-95.
[2] The number of restricted stock units vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.
[3] The weighted average grant date fair value of restricted stock units is based on the number of shares and the closing market price of our common stock on the date of grant.