XML 143 R125.htm IDEA: XBRL DOCUMENT v3.4.0.3

Commitments and Contingent Liabilities (Details) $ in Millions			3 Months Ended	12 Months Ended
	Jan. 26, 2016 relator	Apr. 16, 2013 state relator defendant	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) site	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Claim and litigation charges				$ 0.0	$ 150.0	$ 68.0
Payments for legal settlements				$ 0.0	0.0	105.0
Anti-Kickback Claim
Loss Contingencies [Line Items]
Number of relators | relator		2
Number of states filed on behalf of | state		21
Number of additional defendants | defendant		5
Controlled Substance Investigation
Loss Contingencies [Line Items]
Number of relators | relator	3
Claim and litigation charges			$ 150.0
Claims and litigation charges, after tax			$ 150.0		$ 150.0
Controlled Substance Investigation | Aurora, Colorado | All Controlled Substances
Loss Contingencies [Line Items]
Suspension period			3 years
Controlled Substance Investigation | Livonia, Michigan | All Controlled Substances
Loss Contingencies [Line Items]
Suspension period			2 years
Controlled Substance Investigation | Washington Courthouse, Ohio | All Controlled Substances
Loss Contingencies [Line Items]
Suspension period			2 years
Controlled Substance Investigation | Lakeland, Florida | Hydromorphone
Loss Contingencies [Line Items]
Suspension period			1 year
Environmental Litigation
Loss Contingencies [Line Items]
Number of sites | site				5
Remediation costs				$ 8.1
Hazardous substance sites, number | site				15
Estimated environmental assessment and cleanup costs				$ 1,380.0
Estimated loss				$ 26.0
Environmental Litigation | Minimum
Loss Contingencies [Line Items]
Time frame of disbursements				Apr. 01, 2016
Environmental Litigation | Maximum
Loss Contingencies [Line Items]
Time frame of disbursements				Mar. 31, 2046
Average Wholesale Price Litigation
Loss Contingencies [Line Items]
Claim and litigation charges						68.0
Payments for legal settlements						$ 105.0

X

- Definition

Estimated Environmental Assessment And Cleanup Costs

+ References

No definition available.

+ Details

Name:	mck_EstimatedEnvironmentalAssessmentAndCleanupCosts
Namespace Prefix:	mck_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of sites that hazardous substances were allegedly disposed at.

+ References

No definition available.

+ Details

Name:	mck_HazardousSubstanceSites
Namespace Prefix:	mck_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loss Contingency, Loss in Period, Net of Tax

+ References

No definition available.

+ Details

Name:	mck_LossContingencyLossinPeriodNetofTax
Namespace Prefix:	mck_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Loss Contingency Number of Additional Defendants

+ References

No definition available.

+ Details

Name:	mck_LossContingencyNumberofAdditionalDefendants
Namespace Prefix:	mck_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loss Contingency Number of Relators

+ References

No definition available.

+ Details

Name:	mck_LossContingencyNumberofRelators
Namespace Prefix:	mck_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loss Contingency Number of States Filed On Behalf Of

+ References

No definition available.

+ Details

Name:	mck_LossContingencyNumberofStatesFiledOnBehalfOf
Namespace Prefix:	mck_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loss Contingency, Suspension Period

+ References

No definition available.

+ Details

Name:	mck_LossContingencySuspensionPeriod
Namespace Prefix:	mck_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of sites requiring environmental conditions to be addressed.

+ References

No definition available.

+ Details

Name:	mck_SiteContingencyNumberofSites
Namespace Prefix:	mck_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Recorded amount of the accrual for a material component of an environmental loss contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q2)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

+ Details

Name:	us-gaap_AccrualForEnvironmentalLossContingenciesComponentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q1)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section Y
-Paragraph Question 1

+ Details

Name:	us-gaap_AccrualForEnvironmentalLossContingenciesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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 amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyLossInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Estimated time frame of disbursements over which the accrued or presently unrecognized amounts may be paid out for an individual site.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q2)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section Y
-Paragraph Question 2

+ Details

Name:	us-gaap_SiteContingencyTimeFrameOfDisbursements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mck_AntiKickbackClaimMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mck_ControlledSubstanceInvestigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_CO
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mck_AllControlledSubstancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_MI
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_OH
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mck_HydromorphoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mck_EnvironmentalLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mck_AverageWholesalePriceLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: