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ACQUISITIONS - Narrative (Details) $ / shares in Units, $ in Thousands, € in Millions, merchant in Millions, AUD in Millions |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Apr. 22, 2016 USD ($) employee merchant $ / shares shares | Oct. 05, 2015 USD ($) | Oct. 05, 2015 EUR (€) | Jun. 01, 2015 USD ($) gaming_client_location | Mar. 25, 2015 USD ($) | Mar. 25, 2015 EUR (€) | Oct. 10, 2014 USD ($) | Oct. 10, 2014 AUD | Mar. 04, 2014 USD ($) | May 31, 2016 USD ($) | Feb. 29, 2016 USD ($) | Nov. 30, 2015 USD ($) | Aug. 31, 2015 USD ($) | May 31, 2015 USD ($) | Feb. 28, 2015 USD ($) | Nov. 30, 2014 USD ($) | Aug. 31, 2014 USD ($) | May 31, 2016 USD ($) | May 31, 2015 USD ($) | May 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 4,829,405 |  |  |  | $ 1,491,833 |  |  |  | $ 4,829,405 | $ 1,491,833 |
Revenues |  |  |  |  |  |  |  |  |  | 747,064 | $ 679,940 | $ 722,350 | $ 748,796 | 706,549 | $ 664,983 | $ 697,291 | $ 704,895 | 2,898,150 | 2,773,718 | $ 2,554,236
Operating income (loss) for segments |  |  |  |  |  |  |  |  |  | 56,202 | $ 107,805 | $ 123,165 | $ 137,772 | 103,600 | $ 104,615 | $ 123,984 | $ 124,398 | 424,944 | 456,597 | $ 405,499
Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid per outstanding share (in dollars per share) | $ / shares | $ 53.28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received per outstanding shares (in shares) | shares | 0.6687 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration | $ 3,922,820 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 4,780,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of Heartland common stock (in shares) | shares | 38,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price of Global Payments common stock | $ / shares | $ 73.29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  |  |  |  |  |  | $ 24,400 |  |  |  |  |  |  |  | $ 24,400 |  |
Number of employees added as a result of the merger | employee | 1,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in number of merchants | merchant | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual payment volume as a result of merger | $ 130,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 3,216,248 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, gross | $ 2,043,362 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of Global Payments common stock issued to Heartland's stockholders | $ 1,879,458 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realex Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  | $ 1,200 |
Goodwill |  |  |  |  | $ 66,809 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative percentage ownership after all transactions |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ezidebit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 203,828 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, gross |  |  |  |  |  |  | $ 266,000 | AUD 302.6 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
FIS Gaming Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 94,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers acquired | gaming_client_location |  |  |  | 260 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, gross |  |  |  | $ 237,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PayPros |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 270,878 |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, gross |  |  |  |  |  |  |  |  | $ 426,500 |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Amortization Period [Member] | Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 years |  |
Customer-related intangible assets | Realex Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 years |  |
Customer-related intangible assets | Ezidebit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Customer-related intangible assets | FIS Gaming Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Contract-based and customer-related intangible assets | PayPros |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |
Trade name | Realex Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Trade name | Ezidebit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Acquired technology | Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Acquired technology | Realex Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Acquired technology | Ezidebit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Acquired technology | PayPros |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Trademarks and trade names | Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Euro | Realex Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, gross | € |  |  | € 6.7 |  |  | € 110.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States of America, Dollars | Realex Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, gross |  | $ 7,500 |  |  | $ 118,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Previously Reported | Ezidebit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 192,225 |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Previously Reported | FIS Gaming Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 102,450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Customer-related intangible assets | Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Minimum | Covenants-not-to-compete | Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Maximum | Customer-related intangible assets | Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Maximum | Covenants-not-to-compete | Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Heartland Payment Systems, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue represented by subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
Percentage of operating income represented by subsidiary (less than) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |

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