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SHAREHOLDERS’ EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Shares Repurchased and Retired | Information about shares repurchased and retired was as follows for the periods indicated:
| Year Ended December 31, |  | Seven Months Ended December 31, |  | Year Ended May 31,
| 2018 |  | 2017 |  | 2016 |  | 2016
| (in thousands, except per share amounts)
Number of shares repurchased and retired | 1,927 |  |  | 376 |  |  | 2,518 |  |  | 2,152 |
Cost of shares repurchased, including commissions | $ | 212,196 |  |  | $ | 34,811 |  |  | $ | 178,165 |  |  | $ | 135,954 |
Average cost per share | $ | 110.11 |  |  | $ | 92.51 |  |  | $ | 70.77 |  |  | $ | 63.17 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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