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Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Noncontrolling Interest [Line Items]
Acquisition of additional non-controlling interests		$ 583	$ 0
OT South Africa
Noncontrolling Interest [Line Items]
Ownership percentage by Open Text		70.00%
GXS Singapore
Noncontrolling Interest [Line Items]
Ownership percentage by Open Text		81.00%
GXS Korea
Noncontrolling Interest [Line Items]
Ownership percentage by Open Text				85.00%
Acquisition of additional non-controlling interests	$ 600

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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