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v2.4.1.9

Segments of Business (Narrative) (Details) (Distribution Solutions [Member]) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue derived from services | less than 2% | less than 2% | less than 2% |
Nadro [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity interest in investee |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mck_NadroMember / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mck_NadroMember / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mck_NadroMember / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember

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- Definition Revenue derived from services as a percentage of total revenue of that segment. + References No definition available. + Details
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Namespace Prefix: | mck_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration