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SHARE-BASED AWARDS AND OPTIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost , Allocation of Share-based Compensation Costs by Plan
The following table summarizes share-based compensation expense and the related income tax benefit recognized for our share-based awards and stock options:
 
Year Ended
December 31,
 
Seven Months Ended December 31,
 
Year Ended May 31,
 
2017
 
2016
 
2016
 
2015
 
 
 
 
 
 
 
 
 
(in thousands)
Share-based compensation expense
$
39,095

 
$
18,707

 
$
30,809

 
$
21,056

Income tax benefit
$
13,849

 
$
6,582

 
$
9,879

 
$
6,907
Schedule of Changes in Non-Vested Restricted Stock Awards Activity
The following table summarizes the changes in unvested restricted stock and performance awards for the year ended December 31, 2017, the 2016 fiscal transition period and for the years ended May 31, 2016 and 2015:
 
 
Shares
 
Weighted-Average
Grant-Date
Fair Value
 
 
(in thousands)
 
 
Unvested at May 31, 2014
 
1,754

 
$
22.72

Granted
 
954

 
36.21

Vested
 
(648
)
 
23.17

Forfeited
 
(212
)
 
27.03

Unvested at May 31, 2015
 
1,848

 
28.97

Granted
 
461

 
57.04

Vested
 
(633
)
 
27.55

Forfeited
 
(70
)
 
34.69

Unvested at May 31, 2016
 
1,606

 
37.25

Granted
 
348

 
74.26

Vested
 
(639
)
 
31.38

Forfeited
 
(52
)
 
45.27

Unvested at December 31, 2016
 
1,263

 
49.55

Granted
 
899

 
79.79

Vested
 
(858
)
 
39.26

Forfeited
 
(78
)
 
59.56

Unvested at December 31, 2017
 
1,226

 
$
78.29
Schedule of Share-based Compensation, Stock Options, Activity
The following summarizes changes in stock option activity for the year ended December 31, 2017, the 2016 fiscal transition period and the years ended May 31, 2016 and 2015: 
 
Options
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
 
Aggregate Intrinsic Value
 
(in thousands)
 
 
 
(years)
 
(in millions)
Outstanding at May 31, 2014
1,532

 
$
20.36

 
3.8
 
$
21.3

Granted
306

 
35.78

 
 
 
 
Forfeited
(48
)
 
27.42

 
 
 
 
Exercised
(896
)
 
20.15

 
 
 
16.6

Outstanding at May 31, 2015
894

 
25.47

 
5.2
 
23.9

Granted
145

 
55.92

 
 
 
 
Forfeited
(8
)
 
16.10

 
 
 
 
Exercised
(220
)
 
22.46

 
 
 
9.4

Outstanding at May 31, 2016
811

 
31.81

 
5.8
 
36.8

Granted
73

 
74.66

 
 
 
 
Forfeited
(1
)
 
22.93

 
 
 
 
Exercised
(124
)
 
22.26

 
 
 
6.5

Outstanding at December 31, 2016
759

 
37.51

 
6.0
 
24.5

Granted
124

 
79.45

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Exercised
(160
)
 
23.50

 
 
 
10.1

Outstanding at December 31, 2017
723

 
$
47.79

 
6.4
 
$
37.9

 
 
 
 
 
 
 
 
Options vested and exercisable at December 31, 2017
502

 
$
36.60

 
5.4
 
$
31.9
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
Fair value was estimated on the date of grant using the Black-Scholes valuation model with the following weighted-average assumptions:
 
Year Ended
December 31,
 
Seven Months Ended December 31,
 
Year Ended May 31,
 
2017
 
2016
 
2016
 
2015
Risk-free interest rate
1.99
%
 
1.05
%
 
1.62
%
 
1.57
%
Expected volatility
30.00
%
 
31.58
%
 
28.65
%
 
23.65
%
Dividend yield
0.06
%
 
0.06
%
 
0.10
%
 
0.13
%
Expected term (years)
5

 
5

 
5

 
5