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INCOME TAX - Reconciliation (Details) | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Federal U.S. statutory rate | 35.00% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit | 0.40% | 1.10% | 0.90%
Foreign income taxes (primarily U.K.) | (10.10%) | (8.50%) | (7.20%)
Foreign interest income not subject to tax | (2.60%) | (1.80%) | (2.10%)
Taxes on unremitted earnings | (3.50%) | (0.00%) | (0.00%)
Tax credits and other | 0.40% | 1.00% | 3.10%
Effective tax rate attributable to Global Payments | 19.60% | 26.80% | 29.70%
Effective tax rate allocated to noncontrolling interests | (0.00%) | (0.90%) | (1.20%)
Effective tax rate | 19.60% | 25.90% | 28.50%

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