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ACCOUNTS PAYABLE AND ACCRUED LIABILITY - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2016 | May 31, 2016
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Accounts Payable and Accrued Liabilities [Abstract] |  |
Accrued buyout liability, noncurrent | $ 58.6 | $ 49.1

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- Definition Accrued Buyout Liability, Noncurrent + 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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- References No definition available. + Details
Name: | us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration