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Leases - Narrative (Details) $ in Millions | 6 Months Ended
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Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items] |
Expected future lease payments for leases not yet commenced | $ 170
Total lease receivables | $ 270
Weighted-average remaining lease term | 7 years
Real Property |
Lessee, Lease, Description [Line Items] |
Lease renewal term | 5 years
Minimum |
Lessee, Lease, Description [Line Items] |
Noncancelable lease term of leases not yet commenced | 5 years
Minimum | Facilities |
Lessee, Lease, Description [Line Items] |
Typical remaining lease terms | 1 year
Minimum | Equipment |
Lessee, Lease, Description [Line Items] |
Typical remaining lease terms | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Noncancelable lease term of leases not yet commenced | 15 years
Maximum | Facilities |
Lessee, Lease, Description [Line Items] |
Typical remaining lease terms | 15 years
Maximum | Equipment |
Lessee, Lease, Description [Line Items] |
Typical remaining lease terms | 5 years

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Future Lease Payments + References No definition available. + Details
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Namespace Prefix: | mck_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessor, Sales-type and Direct Financing Leases, Weighted Average Remaining Lease Term + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Period Type: | instant

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919391-209981 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |