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SHARE-BASED AWARDS AND OPTIONS (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
| 2018 |  | 2017 |  | 2016 |  | 2016
| (in thousands)
Share-based compensation expense | $ | 57,826 |  |  | $ | 39,095 |  |  | $ | 18,707 |  |  | $ | 30,809 |
Income tax benefit | $ | 13,038 |  |  | $ | 13,849 |  |  | $ | 6,582 |  |  | $ | 9,879 |
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 years ended December 31, 2018 and 2017, the 2016 fiscal transition period and the year ended May 31, 2016:
|  | Shares |  | Weighted-Average Grant-Date Fair Value
|  | (in thousands) |  |
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 |
Granted |  | 650 |  |  | 109.85 |
Vested |  | (722 | ) |  | 60.08 |
Forfeited |  | (70 | ) |  | 91.47 |
Unvested at December 31, 2018 |  | 1,084 |  |  |  | $108.51 |
Schedule of Share-based Compensation, Stock Options, Activity | The following table summarizes changes in stock option activity for the years ended December 31, 2018 and 2017, the 2016 fiscal transition period and the year ended May 31, 2016:
| Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (years) |  | (in millions)
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 |
Granted | 103 |  |  | 114.70 |  |  |  |  |
Forfeited | (22 | ) |  | 100.38 |  |  |  |  |
Exercised | (206 | ) |  | 42.65 |  |  |  |  | 16.5 |
Outstanding at December 31, 2018 | 598 |  |  |  | $59.16 |  |  | 6.2 |  |  | $27.3 |
Options vested and exercisable at December 31, 2018 | 427 |  |  |  | $44.34 |  |  | 5.2 |  |  | $25.1 |
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,
| 2018 |  | 2017 |  | 2016 |  | 2016
Risk-free interest rate | 2.60 | % |  | 1.99 | % |  | 1.05 | % |  | 1.62 | %
Expected volatility | 29 | % |  | 30 | % |  | 32 | % |  | 29 | %
Dividend yield | 0.04 | % |  | 0.06 | % |  | 0.06 | % |  | 0.10 | %
Expected term (years) | 5 |  |  | 5 |  |  | 5 |  |  | 5 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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