XML 65 R55.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Commitments and Contingent Liabilities (Details) | 2 Months Ended
--- | ---
Sep. 30, 2017 complaint
Litigation, Government Subpoenas and Investigations |
Loss Contingencies [Line Items] |
Number of complaints | 58

X
- 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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=mck_LitigationGovernmentSubpoenasandInvestigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |