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Benefit Plans (Tables)
 12 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of weighted-average assumptions
This fair value was estimated at grant date using the weighted-average assumptions listed below.
 
2019
 
2018
 
2017
 
 
 
 
 
 
Dividend yield
0
%
 
0
%
 
0
%
Expected volatility
48.94
%
 
52.97
%
 
48.90
%
Average risk-free interest rate
3.01
%
 
1.98
%
 
1.20
%
Expected life
6.7 years

 
5.0 years

 
5.0 years
Summary schedule of stock option activity
Option activity for the year ended March 31, 2019 was as follows:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
 
Options outstanding, beginning of year
497,728

 
$
70.69

 
 
 
 
Granted
324,870

 
101.67

 
 
 
 
Exercised
(92,428
)
 
64.89

 
 
 
 
Forfeited
(8,330
)
 
77.66

 
 
 
 
Expired
(18,052
)
 
82.92

 
 
 
 
Options outstanding, end of period
703,788

 
$
85.33

 
7.18
 
$
22,391,720

Options exercisable, end of period
299,661

 
$
70.72

 
4.55
 
$
13,908,625
Intrinsic value of options exercised
The total intrinsic value of options exercised during the periods ended March 31, 2019, 2018, and 2017 was as follows:
2019
 
2018
 
2017
 
 
 
 
 
$4,433,495
 
$12,336,156
 
$661,164
Shares vesting based on the compounded annual EPS growth


Summary of the status and changes restricted stock
A summary of the status of the Company’s restricted stock as of March 31, 2019 and changes during the year ended March 31, 2019, are presented below:
 
Shares
 
Weighted Average Fair
Value at Grant Date
 
 
 
 
Outstanding at March 31, 2018
73,810

 
$
65.74

Granted during the period
760,420

 
101.61

Vested during the period
(40,184
)
 
55.12

Forfeited during the period
(10,596
)
 
98.47

Outstanding at March 31, 2019
783,450

 
$
100.66
Share-based compensation included as a component of net income
Total stock-based compensation included as a component of net income during the years ended March 31, 2019, 2018, and 2017 was as follows:
 
2019
 
2018
 
2017
Stock-based compensation related to equity classified units:
 
 
 
 
 
Stock-based compensation related to stock options
$
3,991,967

 
2,353,214

 
3,490,662

Stock-based compensation related to restricted stock
13,643,343

 
3,081,405

 
1,604,257

Total stock-based compensation related to equity classified awards
$
17,635,310

 
5,434,619

 
5,094,919