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Share-Based Compensation (Tables)
 12 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Shares
A summary of the Company’s RSUs granted under the Plan is presented below:
 
 
 
RSUs
 
Shares
(in thousands)
 
Weighted-Average
Grant-Date
Fair Value
Vested and nonvested at March 31, 2015
 
362.3

 
$
22.74

 
 
 
 
 
Granted
 
266.1

 
42.41

Vested and issued
 
(155.6
)
 
18.31

Forfeited
 
(5.0
)
 
39.61

Vested and nonvested at March 31, 2016
 
467.8

 
35.22

Vested at March 31, 2016
 
69.8

 
14.76

 
 
 
 
 
Granted
 
68.4

 
55.44

Vested and issued
 
(94.7
)
 
28.51

Forfeited
 
(91.4
)
 
41.71

Vested and nonvested at March 31, 2017
 
350.1

 
39.29

Vested at March 31, 2017
 
63.4

 
20.12

 
 
 
 
 
Granted
 
105.8

 
55.61

Vested and issued
 
(53.3
)
 
34.30

Forfeited
 
(9.1
)
 
48.76

Vested and nonvested at March 31, 2018
 
393.5

 
44.13

Vested at March 31, 2018
 
90.5

 
29.88
Stock Options, Valuation Assumptions

The weighted-average grant-date fair values of the options granted during 2018, 2017, and 2016 were $21.20, $21.75, and $17.24, respectively.
 
Year Ended March 31,
 
2018
 
2017
 
2016
Expected volatility
35.2
%
 
37.8
%
 
40.2
%
Expected dividends
—

 
—

 
—

Expected term in years
6.0

 
6.0

 
6.0

Risk-free rate
2.2
%
 
1.7
%
 
1.7
%
Stock Option Activity


A summary of option activity under the Plan is as follows:
Options
 
Shares
(in thousands)
 
Weighted-Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value
(in thousands)
 
 
 
 
 
 
 
 
 
Outstanding at March 31, 2015
 
871.2

 
$
23.40

 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
208.2

 
42.13

 
 
 
 
Exercised
 
(348.0
)
 
19.22

 
 
 
 
Forfeited or expired
 
(3.7
)
 
35.72

 
 
 
 
Outstanding at March 31, 2016
 
727.7

 
30.70

 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
264.3

 
55.86

 
 
 
 
Exercised
 
(126.8
)
 
31.75

 
 
 
 
Forfeited or expired
 
(92.9
)
 
42.66

 
 
 
 
Outstanding at March 31, 2017
 
772.3

 
37.70

 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
182.8

 
56.11

 
 
 
 
Exercised
 
(55.7
)
 
29.08

 
 
 
 
Forfeited or expired
 
(26.2
)
 
48.19

 
 
 
 
Outstanding at March 31, 2018
 
873.2

 
41.79

 
7.0
 
$
2,985

Exercisable at March 31, 2018
 
495.0

 
32.41

 
5.8
 
$
2,985