Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Spin-Off costs included in selling, general, and administrative expense and not allocated to segments	$ 0.8	$ 5.1	$ 1.3	$ 6.7
Corporate [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Project costs on incremental strategic investment	$ 2.9	$ 2.7	$ 9.8	$ 3.4

Spin Off Costs included in Selling, General, and Administrative Expense And not allocated to segments

No definition available.

Name:	cah_SpinOffCostsIncludedInSellingGeneralAndAdministrativeExpenseAndNotAllocatedToSegments
Namespace Prefix:	cah_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration