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SHARE-BASED AWARDS AND OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 7 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | May 31, 2016 | May 31, 2015 | May 31, 2014 | May 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 73 | 145 | 306 |  | 0
Share-based compensation expense | $ 18,707 | $ 30,809 | $ 21,056 | $ 29,793 |
Aggregate intrinsic value of stock options exercised | 6,500 | 9,400 | 16,600 | 24,900 |
Total unrecognized compensation cost |  | $ 1,700 |  |  |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair market value, percentage |  | 100.00% |  |  |
Stock option term |  | 10 years |  |  |
Share-based compensation expense | $ 1,100 | $ 1,400 | $ 700 | $ 1,000 |
Total unrecognized compensation cost, weighted average period (in years) |  | 1 year 10 months 24 days |  |  |
Stock Option Plan 2011 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value (in dollars per share) | $ 21.87 | $ 15.60 | $ 8.45 |  |
Granted Before Fiscal 2015 | Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |
Granted Fiscal 2015 | Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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