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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

X

- Definition

Write-off of Capitalized Software Assets

+ References

No definition available.

+ Details

Name:	gpn_WriteoffofCapitalizedSoftwareAssets
Namespace Prefix:	gpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- Details

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