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Stock-Based Compensation (Tables)
12 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-based Compensation Expense Recognized in the Consolidated Statements of Operations
The following table summarizes stock-based compensation expense recognized in the consolidated statements of operations: 
 
Fiscal Year Ended March 31,
 
2019
 
2018
 
2017
Cost of revenue
$
8,990

 
$
7,771

 
$
5,756

General and administrative expenses
22,285

 
15,547

 
15,493

Total
$
31,275

 
$
23,318

 
$
21,249

The following table summarizes the total stock-based compensation expense recognized in the consolidated statements of operations by the following types of equity awards:
 
Fiscal Year Ended March 31,
 
2019
 
2018
 
2017
Equity Incentive Plan Options
$
2,374

 
$
2,036

 
$
2,523

Restricted Stock Awards
28,901

 
21,282

 
18,726

Total
$
31,275

 
$
23,318

 
$
21,249

Schedule of Unrecognized Compensation Cost
Absent the effect of accelerating stock compensation cost for any departures of employees who may continue to vest in their equity awards, the following tables summarize the unrecognized compensation cost, the weighted average period the cost is expected to be amortized, and the estimated annual compensation cost for the future periods indicated below (excludes any future awards): 
 
 
Unrecognized Compensation Cost
 
Weighted Average Remaining Period to be Recognized
 
 
March 31,
2019
 
March 31,
2018
 
March 31,
2019
 
March 31,
2018
Equity Incentive Plan Options
 
$
3,501

 
$
2,809

 
3.61
 
3.60
Restricted Stock Awards
 
24,259

 
14,512

 
1.75
 
1.87
Total
 
$
27,760

 
$
17,321

 
 
 
 

 
 
Total Unrecognized Compensation Cost
 
 
Total
 
2020
 
2021
 
2022
 
2023
 
2024
Equity Incentive Plan Options
 
$
3,501

 
$
1,766

 
$
1,001

 
$
541

 
$
182

 
$
11

Restricted Stock Awards
 
24,259

 
16,662

 
7,570

 
27

 

 

Total
 
$
27,760

 
$
18,428

 
$
8,571

 
$
568

 
$
182

 
$
11

Summary of Stock Options Outstanding
The following table summarizes stock option activity for the periods presented: 
 
 
Number of
Options
 
Weighted
Average
Exercise
Price
 
 
Equity Incentive Plan Options
 
 
 
 
 
 
Options outstanding at March 31, 2018
 
2,799,954

 
$
18.55

 
*
Granted
 
356,679

 
44.14

 
  
Forfeited
 
45,313

 
33.96

 
  
Expired
 

 

 
  
Exercised
 
1,019,965

 
11.88

 
  
Options outstanding at March 31, 2019
 
2,091,355

 
$
25.83

 
*
* Reflects exercise price adjustment of $6.36 per grant for the $6.50 dividend per share issued on July 30, 2012.
The following table summarizes unvested stock options for the periods presented: 
 
 
Number of
Options
 
Weighted
Average Grant Date
Fair Value
Equity Incentive Plan Options
 
 
 
 
Unvested at March 31, 2018
 
637,867

 
$
7.68

Granted
 
356,679

 
9.67

Vested
 
340,620

 
7.24

Forfeited
 
45,313

 
8.47

Unvested at March 31, 2019
 
608,613

 
$
9.04


The following table summarizes stock options outstanding at March 31, 2019: 
Range of exercise prices
 
Stock
Options
Outstanding
 
Weighted
Average
Exercise Price
 
 
Weighted
Average
Remaining
Contractual Life
 
Intrinsic Value
 
Stock
Options
Exercisable
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual Life
Intrinsic Value
 
 
 
 
 
 
 
(In years)
 
 
 
 
 
 
 
(In years)
 
Equity Incentive Plan
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$4.28 - $51.82
 
2,091,355
 
$25.83
 
(1)
5.64
 
$
67,564

 
1,482,742
 
$20.58
 
4.49
$55,694
(1) Reflects exercise price adjustment of $6.36 per grant for the $6.50 dividend per share issued July 30, 2012.
The following table summarizes options granted under the Amended and Restated Equity Incentive Plan, or EIP during fiscal 2019:
Grant Date
Options Granted
Estimated Fair Value per Option Grant
Total Fair Value
May 23, 2018
203,040

$
9.36

$
1,900

July 25, 2018
4,737

10.55

50

July 30, 2018
29,096

10.31

300

October 24, 2018
5,169

9.67

50

November 5, 2018
29,919

10.03

300

November 13, 2018
4,558

10.97

50

November 14, 2018
23,193

10.78

250

January 29, 2019
56,967

9.65

550

 
356,679

 
$
3,450

Schedule of Black Scholes Weighted Average Assumptions
The weighted average assumptions used in the Black-Scholes option-pricing model for stock option awards were as follows:
 
 
For The Fiscal Year Ended March 31, 
 
 
2019
 
2018
 
2017
Dividend yield
 
2.01
%
 
1.90
%
 
1.94
%
Expected volatility
 
25.83
%
 
33.04
%
 
29.65
%
Risk-free interest rate
 
2.81
%
 
1.81
%
 
1.38
%
Expected life (in years)
 
5.00

 
5.00

 
5.00

Weighted-average grant date fair value
 
$
9.67

 
$
9.35

 
$
7.16

Schedule of Unvested Restricted Stock Activity
The following table summarizes unvested restricted stock activity for the periods presented:
 
 
Number of
Shares
 
Weighted
Average Grant Date
Fair Value
 
 
 
 
 
Unvested Restricted Stock Awards
 
 
 
 
Unvested at March 31, 2018
 
957,106

 
32.36

Granted
 
654,897

 
42.40

Vested
 
637,212

 
33.80

Forfeited
 
42,010

 
37.64

Unvested at March 31, 2019
 
932,781

 
38.19