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PROPERTY AND EQUIPMENT - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 USD ($)
Software |
Property, Plant and Equipment [Line Items] |
Write-off of capitalized software assets | $ 31.1

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- Definition Write-off of Capitalized Software Assets + References No definition available. + Details
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Namespace Prefix: | gpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |