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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accrued Buyout Liability (Details) | 12 Months Ended
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May 31, 2016 USD ($)
Accounting Policies [Abstract] |
Fixed multiple period for buy out of sales commissions | 12 months
Determination of accrued buyout liability, gross margin for prior period | 12 months
Liability related to new merchant | $ 0
Period of accrued buyout liability increases for new merchants | 12 months

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- Definition Buyout of Relationship Managers and Sales Managers Commissions, Fixed Multiple Period + References No definition available. + Details
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- Definition Determination of Accrued Buyout Liability, Gross Margin for Prior Period + References No definition available. + Details
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- Definition New Merchant Accrued Buyout Liability + References No definition available. + Details
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Namespace Prefix: | gpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Period Accrued Buyout Liability Increases for New Merchants + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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