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Reportable Segment Information Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) segment
Segment Reporting [Abstract] |  |
Number of Reportable Segments | segment |  | 4
Reclassification of Revenue Between Reportable Segments | $ | $ 744 | $ 1,482

X
- Definition Reclassification of Revenue Between Reportable Segments + References No definition available. + Details
Name: | jkhy_ReclassificationofRevenueBetweenReportableSegments
Namespace Prefix: | jkhy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration