XML 44 R38.htm IDEA: XBRL DOCUMENT v3.19.3
STOCK-BASED COMPENSATION (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Document Fiscal Year Focus     2020  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 655,462 468,253 669,374 477,357
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00% 0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 51.25% 0.00% 50.90% 53.02%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.54% 0.00% 1.70% 2.84%
Stock Option Plans [Abstract]        
Number of shares available for grant (in shares) 204,744   204,744  
Weighted-average fair value at the grant date $ 71.31   $ 70.69 $ 49.67
Options Activity [Roll Forward]        
Exercised (in shares) (15,706) (4,446) (55,472) (25,276)
Restricted Stock [Abstract]        
Grant date fair value (in dollars per share)     $ 101.61 $ 107.52
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Grant date fair value (in dollars per share)     $ 101.61 $ 107.52
Compensation related to stock option and restricted stock plans     $ 16,602,477 $ 2,977,986
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 6 months 0 days 6 years 7 months 6 days 5 years
Stock Options Plans [Member]        
Stock Option Plans [Abstract]        
Shares of authorized common stock reserved for issuance (in shares) 4,350,000   4,350,000  
Options Activity [Roll Forward]        
Options outstanding, beginning of year (in shares)     704,240  
Granted (in shares)     6,500  
Exercised (in shares)     (55,472)  
Forfeited (in shares)     (4,643)  
Expired (in shares)     (120)  
Options outstanding, end of period (in shares) 650,505   650,505  
Options exercisable, end of period (in shares) 245,807   245,807  
Weighted Average Exercise Price [Roll Forward]        
Options outstanding, beginning of year (in dollars per share)     $ 85.33  
Granted (in dollars per share)     137.58  
Exercised (in dollars per share)     65.87  
Forfeited (in dollars per share)     98.16  
Expired (in dollars per share)     82.86  
Options outstanding, end of period (in dollars per share) $ 87.42   87.42  
Options exercisable, end of period (in dollars per share) $ 71.81   $ 71.81  
Stock Option Activity Additional Disclosures [Abstract]        
Weighted-average remaining contractual term, Options outstanding, end of period     6 years 10 months 24 days  
Weighted-average remaining contractual terms, Options exercisable, end of period     3 years 10 months 24 days  
Aggregate intrinsic value, Options outstanding, end of period $ 26,137,340   $ 26,137,340  
Aggregate intrinsic value, Options exercisable, end of period 13,687,863   13,687,863  
Intrinsic value of options exercised 1,515,230 $ 150,407 4,350,557 $ 1,091,547
Compensation Cost Not yet Recognized [Abstract]        
Total unrecognized stock-based compensation expense related to non-vested stock options 12,600,000   $ 12,600,000  
Weighted average period for recognition     4 years 9 months 18 days  
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]        
Weighted average period for recognition     4 years 9 months 18 days  
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Compensation related to stock option and restricted stock plans 1,604,772 539,410 $ 3,226,110 $ 1,063,637
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Issued During Period, Shares, Share-based Compensation, Gross     760,420 24,456
Restricted Stock [Abstract]        
Grant date fair value (in dollars per share)     $ 0  
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options $ 52,500,000   $ 52,500,000  
Summary of the status and changes in restricted stock [Roll Forward]        
Outstanding at Beginning of Year (in shares)     783,450  
Awards granted (in shares)     0  
Vested during the period, net of cancellations (in shares)     (3,601)  
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited     0  
Outstanding at End of Period (in shares) 779,849   779,849  
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Outstanding at March 31, 2012 (in dollars per share)     $ 100.66  
Grant date fair value (in dollars per share)     0  
Vested during the period, net of cancellations (in dollars per share)     101.78  
Cancelled during the period (in dollars per share)     0  
Outstanding at June 30, 2012 (in dollars per share) $ 100.65   $ 100.65  
Compensation related to stock option and restricted stock plans $ 6,685,497 963,559 $ 13,376,367 $ 1,914,349
Equity Securities [Member]        
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Compensation related to stock option and restricted stock plans $ 8,290,269 $ 1,502,969 $ 16,602,477 $ 2,977,986
Performance Shares [Member]        
Compensation Cost Not yet Recognized [Abstract]        
Weighted average period for recognition     4 years  
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]        
Weighted average period for recognition     4 years  
Maximum [Member] | Stock Options Plans [Member]        
Stock Option Plans [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years  
Vesting period     5 years  
Minimum [Member] | Stock Options Plans [Member]        
Stock Option Plans [Abstract]        
Vesting period     3 years