Annual Recurring Compensation Per Share to Noncontrolling Interests

No definition available.

Name:	mck_AnnualRecurringCompensationPerSharetoNoncontrollingInterests
Namespace Prefix:	mck_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Increase In Paid In Capital.

+ References

No definition available.

+ Details

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

- Definition

Noncontrolling Interests, Put Right, Exercise Price

+ References

No definition available.

+ Details

Name:	mck_NoncontrollingInterestsPutRightExercisePrice
Namespace Prefix:	mck_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Put Right Value Per Share, Interest Rate Spread

+ References

No definition available.

+ Details

Name:	mck_PutRightValuePerShareInterestRateSpread
Namespace Prefix:	mck_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Redeemable Noncontrolling Interests, Maximum Redemption Value

+ References

No definition available.

+ Details

Name:	mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue
Namespace Prefix:	mck_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4M

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (16)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (12)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 15

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 14

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

+ Details

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

Redeemable Noncontrolling Interests (Narrative) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2015 € / shares	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)
Noncontrolling Interest [Abstract]
NCI, annual compensation per share \| € / shares		€ 0.83
NCI, put right redemption price per share \| € / shares		€ 22.99
NCI, put right per share interest rate spread			5.00%
Redeemable Noncontrolling Interests			$ 1,430	$ 1,386
Redeemable NCI, maximum redemption value			$ 1,260	$ 1,210
NCI, ownership percentage			76.00%	76.00%
NCI, change in ownership, paid in capital	$ 3
NCI, change in ownership, net income attributable to parent and NCI transfers	$ 406