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Commitments, Contingent Liabilities and Litigation (Narrative) (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 02, 2015 USD ($) | Sep. 30, 2015 USD ($) distributor | Sep. 30, 2014 USD ($) | Jun. 30, 2015 USD ($)
Commitments [Abstract] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 1,399.0 | $ 61.0 |
DEA Investigation and Related Matters |  |  |  |
Loss Contingencies |  |  |  |
Litigation charges |  |  | $ 27.0 | $ 41.0
Litigation accrual |  | $ 41.0 |  |
State of West Virginia vs Cardinal Health, Inc |  |  |  |
Loss Contingencies |  |  |  |
Number of defendants | distributor |  | 13 |  |
Cordis |  |  |  |
Commitments [Abstract] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 1,900.0 |  |  |
CVS Health |  |  |  |
Commitments [Abstract] |  |  |  |
Initial term of Pharmaceutical Sourcing Venture |  | 10 years |  |
Number of quarterly payments |  | 39 |  |
Quarterly payment |  | $ 25.6 |  |
Increase in quarterly payments |  | 10.0 |  |
Fiscal 2017 | CVS Health |  |  |  |
Commitments [Abstract] |  |  |  |
Further Increase in Quarterly Payments |  | 10.0 |  |
Maximum Quarterly Payment |  | $ 45.6 |  |

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