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SEGMENT INFORMATION - Narrative (Details) - USD ($) $ in Millions | 7 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | May 31, 2016 | May 31, 2015 | May 31, 2014
Sales Revenue, Net | Geographic Concentration Risk | United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of total consolidated revenues from external customers | 67.00% | 61.00% | 60.00% | 58.00%
Sales Revenue, Net | Geographic Concentration Risk | United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of total consolidated revenues from external customers | 10.00% | 10.00% | 13.00% | 13.00%
Sales Revenue, Net | Geographic Concentration Risk | Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of total consolidated revenues from external customers |  | 10.00% | 11.00% | 13.00%
Heartland Payment Systems, Inc |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Business Combination, Acquisition Related Costs | $ 91.6 | $ 51.3 |  |

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