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Income Tax - Reconciliation (Details)
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Income Tax Disclosure [Abstract]      
Federal U.S. statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal income tax benefit 1.10% 0.90% 0.90%
Foreign income taxes (8.50%) (7.20%) (7.00%)
Foreign interest income not subject to tax (1.80%) (2.10%) (2.80%)
Tax credits and other 1.00% 3.10% 3.70%
Effective tax rate attributable to Global Payments 26.80% 29.70% 29.80%
Effective tax rate allocated to noncontrolling interests (0.90%) (1.20%) (1.20%)
Effective tax rate 25.90% 28.50% 28.60%