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SHARE-BASED AWARDS AND OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted (in shares) |  |  | 73,000 | 100,000.0
Share-based compensation expense | $ 8,747 | $ 7,005 | $ 16,366 | $ 13,472
Aggregate intrinsic value of stock options exercised |  |  | 6,500 | 4,800
Total unrecognized compensation cost | $ 1,800 |  | $ 1,800 |
Employee stock option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair market value (as a percentage) | 100.00% |  | 100.00% |
Stock option term |  |  | 10 years |
Share-based compensation expense | $ 500 | $ 400 | $ 900 | $ 600
Total unrecognized compensation cost, weighted average period |  |  | 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 for each option granted (in USD per share) | $ 21.87 | $ 15.60 | $ 21.87 | $ 15.60
Granted Before Fiscal 2015 | Employee stock option | Performance period. year one |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of award vesting rights |  |  | 25.00% |
Granted Before Fiscal 2015 | Employee stock option | Performance period, year two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of award vesting rights |  |  | 25.00% |
Granted Before Fiscal 2015 | Employee stock option | Performance period, year three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of award vesting rights |  |  | 25.00% |
Granted Before Fiscal 2015 | Employee stock option | Performance period, year four |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of award vesting rights |  |  | 25.00% |
Granted Fiscal 2015 | Employee stock option | Performance period. year one |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of award vesting rights |  |  | 33.00% |
Granted Fiscal 2015 | Employee stock option | Performance period, year two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of award vesting rights |  |  | 33.00% |
Granted Fiscal 2015 | Employee stock option | Performance period, year three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of award vesting rights |  |  | 33.00% |

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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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