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Stock-Based Compensation (Tables)
12 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Fair Value of Options Granted
The fair value of each option granted under the Plan was estimated on the date of grant using the Black-Scholes valuation model that uses the following weighted-average assumptions:
 
Years Ended
 
March 31, 2019
 
March 31, 2018
 
March 31, 2017
Expected option term (in years)
6.5

 
6.5

 
6.5

Expected volatility factor
30
%
 
31
%
 
29
%
Weighted-average risk free interest rate
2.85
%
 
1.99
%
 
1.58
%
Expected dividend rate
0.0
%
 
0.0
%
 
0.0
%
Schedule of Stock Options Activity
A summary of stock option activity during fiscal 2019, 2018 and 2017 is as follows:
 
Years Ended
 
March 31, 2019
 
March 31, 2018
 
March 31, 2017
 
Shares
 
Weighted Avg. Exercise Price
 
Shares
 
Weighted Avg. Exercise Price
 
Shares
 
Weighted Avg. Exercise Price
Number of shares under options:
 
 
 
 
 
 
 
 
 
 
 
Outstanding at beginning of period
8,117,947

 
$
19.50

 
7,770,670

 
$
18.73

 
7,854,685

 
$
15.10

Granted
564,666

 
28.88

 
1,176,205

 
23.17

 
2,602,014

 
19.72

Exercised (1)
(642,953
)
 
14.21

 
(543,443
)
 
14.89

 
(2,116,571
)
 
5.18

Canceled/Forfeited
(195,749
)
 
23.95

 
(285,485
)
 
22.55

 
(569,458
)
 
23.34

Outstanding at end of period (2)
7,843,911

 
$
20.49

 
8,117,947

 
$
19.50

 
7,770,670

 
$
18.73

Exercisable at end of period (3)
5,833,565

 
$
19.42

 
4,810,737

 
$
17.93

 
3,221,622

 
$
15.25

______________________
(1)
The total intrinsic value of options exercised during fiscal 2019, 2018 and 2017 was $9.9 million, $6.4 million and $29.1 million, respectively.
(2)
The weighted average remaining contractual life of options outstanding was 5.5 years at March 31, 2019, 6.1 years at March 31, 2018 and 6.6 years at March 31, 2017. The aggregate intrinsic value of options outstanding at March 31, 2019 was $41.2 million.
(3)
The weighted average remaining contractual life of options exercisable was 4.6 years at March 31, 2019, 4.7 years at March 31, 2018 and 4.6 years at March 31, 2017. The aggregate intrinsic value of options exercisable at March 31, 2019 was $36.0 million.

 
Shares
 
Weighted Avg. Exercise Price
Nonvested options at beginning of period
3,307,210

 
$
21.77

Granted
564,666

 
28.88

Vested
(1,706,123
)
 
21.78

Canceled/Forfeited
(155,407
)
 
23.71

Nonvested options at end of period
2,010,346

 
$
23.61

Schedule of Restricted Stock Units Activity
A summary of RSU activity during fiscal 2019, 2018, and 2017 is as follows:
 
Years Ended
 
March 31, 2019
 
March 31, 2018
 
March 31, 2017
 
Units
 
Weighted Avg. Grant Date Fair Value
 
Units
 
Weighted Avg. Grant Date Fair Value
 
Units
 
Weighted Avg. Grant Date Fair Value
Nonvested RSUs at beginning of period
368,182

 
$
21.55

 
322,142

 
$
20.59

 
125,307

 
$
24.67

Granted
300,119

 
28.87

 
250,013

 
23.19

 
279,445

 
19.53

Vested
(149,531
)
 
24.30

 
(150,784
)
 
21.92

 
(48,207
)
 
24.01

Canceled/Forfeited
(101,423
)
 
21.10

 
(53,189
)
 
22.41

 
(34,403
)
 
22.00

Nonvested RSUs at end of period
417,347

 
$
25.94

 
368,182

 
$
21.55

 
322,142

 
$
20.59

Schedule of Nonvested Performance-based Units Activity
A summary of PSU activity during fiscal 2019, 2018, and 2017 is as follows:
 
Years Ended
 
March 31, 2019
 
March 31, 2018
 
March 31, 2017
 
Units
 
Weighted Avg. Grant Date Fair Value
 
Units
 
Weighted Avg. Grant Date Fair Value
 
Units
 
Weighted Avg. Grant Date Fair Value
Nonvested PSUs at beginning of period
453,001

 
$
25.53

 
259,930

 
$
24.74

 
49,136

 
$
28.57

Granted
183,069

 
28.91

 
193,071

 
26.58

 
219,266

 
23.95

Vested
(217,319
)
 
23.89

 

 

 

 

Canceled/Forfeited
(67,647
)
 
28.37

 

 

 
(8,472
)
 
25.90

Nonvested PSUs at end of period
351,104

 
$
27.76

 
453,001

 
$
25.53

 
259,930

 
$
24.74

Schedule of Weighted-Average Assumptions Used, Performance Stock Units
 
Years Ended
 
March 31, 2018
 
March 31, 2017
Expected volatility factor
31
%
 
30
%
Weighted-average risk-free interest rate
1.45
%
 
0.86
%
Expected dividend rate
0.0
%
 
0.0
%
PSU fair value per share
$31.25
 
$27.67
The following table presents significant assumptions used to determine benefit obligations and net periodic benefit cost (income) in weighted-average percentages:
 
Pension Benefits
 
Other Postretirement Benefits
 
March 31, 2019
 
March 31, 2018
 
March 31, 2017
 
March 31, 2019
 
March 31, 2018
 
March 31, 2017
Benefit Obligations:
 
 
 
 
 
 
 
 
 
 
 
Discount rate
3.7
%
 
3.7
%
 
3.9
%
 
3.9
%
 
4.0
%
 
4.0
%
Rate of compensation increase
2.9
%
 
2.9
%
 
3.0
%
 
n/a

 
n/a

 
n/a

Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
 
 
 
Discount rate
3.7
%
 
3.9
%
 
3.8
%
 
4.0
%
 
4.0
%
 
3.9
%
Rate of compensation increase
2.9
%
 
3.0
%
 
3.0
%
 
n/a

 
n/a

 
n/a

Expected return on plan assets
5.1
%
 
5.3
%
 
5.3
%
 
n/a

 
n/a

 
n/a