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INCOME TAX - Reconciliation (Details)	12 Months Ended
	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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