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ACQUISITIONS - Pro Forma Information - Unaudited (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
PayPros |  |  |
Business Acquisition [Line Items] |  |  |
Total revenues, Actual |  |  | $ 2,554,236
Total revenues, Pro forma |  |  | 2,628,547
Net income attributable to Global Payments, Actual |  |  | 245,286
Net income attributable to Global Payments, Pro forma |  |  | $ 241,272
Heartland Payment Systems, Inc |  |  |
Business Acquisition [Line Items] |  |  |
Total revenues, Actual | $ 2,898,150 | $ 2,773,718 |
Total revenues, Pro forma | 3,993,974 | 3,668,851 |
Net income attributable to Global Payments, Actual | 271,666 | 278,040 |
Net income attributable to Global Payments, Pro forma | $ 234,632 | $ 149,900 |

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