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Available-for-Sale Securities (Narrative) (Details) | 12 Months Ended
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Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items] |
Weighted average effective maturity | 7 months

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- Definition Weighted average effective maturity of the available-for-sale securities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | cah_WeightedAverageEffectiveMaturityPeriod
Namespace Prefix: | cah_
Data Type: | xbrli:durationItemType
Balance Type: | na
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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration