XML 88 R98.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Debt And Financing Activities (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 9,709us-gaap_LongTermDebt | $ 10,346us-gaap_LongTermDebt |
Less current portion | (1,529)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | (1,417)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |
Total long-term debt | 8,180us-gaap_LongTermDebtAndCapitalLeaseObligations | 8,929us-gaap_LongTermDebtAndCapitalLeaseObligations |
Floating Rate Notes Due September 10, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 400us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FloatingRateNotesDueSeptemberTenthTwoThousandFifteenMember | 400us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FloatingRateNotesDueSeptemberTenthTwoThousandFifteenMember |
Debt variable interest rate | 0.66%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_LongtermDebtTypeAxis = mck_FloatingRateNotesDueSeptemberTenthTwoThousandFifteenMember |  |
Debt maturity date | Sep. 10, 2015 | Sep. 10, 2015 |
0.95% Notes Due December 4, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_ZeroPointNineFivePercentNotesDueDecemberFourTwoThousandFifteenMember | 499us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_ZeroPointNineFivePercentNotesDueDecemberFourTwoThousandFifteenMember |
Debt interest rate | 0.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_ZeroPointNineFivePercentNotesDueDecemberFourTwoThousandFifteenMember | 0.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_ZeroPointNineFivePercentNotesDueDecemberFourTwoThousandFifteenMember | 0.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_ZeroPointNineFivePercentNotesDueDecemberFourTwoThousandFifteenMember
Debt maturity date | Dec. 04, 2015 | Dec. 04, 2015 | Dec. 04, 2015
3.25% Notes Due March 1, 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 600us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_ThreePointTwoFivePercentNotesDueMarchOneTwoThousandSixteenMember | 599us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_ThreePointTwoFivePercentNotesDueMarchOneTwoThousandSixteenMember |
Debt interest rate | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_ThreePointTwoFivePercentNotesDueMarchOneTwoThousandSixteenMember | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_ThreePointTwoFivePercentNotesDueMarchOneTwoThousandSixteenMember |
Debt maturity date | Mar. 01, 2016 | Mar. 01, 2016 |
5.70% Notes Due March 1, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FivePointSevenZeroPercentNotesDueMarchOneTwoThousandSeventeenMember | 500us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FivePointSevenZeroPercentNotesDueMarchOneTwoThousandSeventeenMember |
Debt interest rate | 5.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FivePointSevenZeroPercentNotesDueMarchOneTwoThousandSeventeenMember | 5.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FivePointSevenZeroPercentNotesDueMarchOneTwoThousandSeventeenMember |
Debt maturity date | Mar. 01, 2017 | Mar. 01, 2017 |
1.29% Notes Due March 10, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 700us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_OnePointTwoNinePercentNotesDueMarchTenthTwoThousandSeventeenMember | 700us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_OnePointTwoNinePercentNotesDueMarchTenthTwoThousandSeventeenMember |
Debt interest rate | 1.29%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_OnePointTwoNinePercentNotesDueMarchTenthTwoThousandSeventeenMember | 1.29%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_OnePointTwoNinePercentNotesDueMarchTenthTwoThousandSeventeenMember |
Debt maturity date | Mar. 10, 2017 | Mar. 10, 2017 |
1.40% Notes Due March 15, 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 499us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember | 499us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember |
Debt interest rate | 1.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember | 1.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember | 1.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember
Debt maturity date | Mar. 15, 2018 | Mar. 15, 2018 | Mar. 15, 2018
7.50% Notes Due February 15, 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 349us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember | 349us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember |
Debt interest rate | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember |
Debt maturity date | Feb. 15, 2019 | Feb. 15, 2019 |
2.28% Notes Due March 15, 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 1,100us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember | 1,100us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember |
Debt interest rate | 2.28%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember | 2.28%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember |
Debt maturity date | Mar. 15, 2019 | Mar. 15, 2019 |
4.75% Notes Due March 1, 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 599us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember | 598us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember |
Debt interest rate | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember |
Debt maturity date | Mar. 01, 2021 | Mar. 01, 2021 |
2.70% Notes Due December 15, 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 400us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember | 400us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember |
Debt interest rate | 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember | 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember | 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember
Debt maturity date | Dec. 15, 2022 | Dec. 15, 2022 | Dec. 15, 2022
2.85% Notes Due March 15, 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 400us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember | 400us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember |
Debt interest rate | 2.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember | 2.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember | 2.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember
Debt maturity date | Mar. 15, 2023 | Mar. 15, 2023 | Mar. 15, 2023
3.80% Notes Due March 15, 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 1,100us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember | 1,100us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember |
Debt interest rate | 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember | 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember |
Debt maturity date | Mar. 15, 2024 | Mar. 15, 2024 |
7.65% Debentures Due March 1, 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 175us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember | 175us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember |
Debt interest rate | 7.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember | 7.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember |
Debt maturity date | Mar. 01, 2027 | Mar. 01, 2027 |
6.00% Notes Due March 1, 2041 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 493us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember | 493us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember |
Debt interest rate | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember |
Debt maturity date | Mar. 01, 2041 | Mar. 01, 2041 |
4.88% Notes Due March 15, 2044 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 800us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember | 800us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember |
Debt interest rate | 4.88%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember | 4.88%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember |
Debt maturity date | Mar. 15, 2044 | Mar. 15, 2044 |
Other Long Term Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 26us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_OtherLongTermDebtMember | 27us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_OtherLongTermDebtMember |
4.00% Bonds Due October 18, 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 388us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPercentBondsDueOctoberEighteenTwoThousandSixteenMember | 507us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPercentBondsDueOctoberEighteenTwoThousandSixteenMember |
Debt interest rate | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPercentBondsDueOctoberEighteenTwoThousandSixteenMember | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPercentBondsDueOctoberEighteenTwoThousandSixteenMember |
Debt maturity date | Oct. 18, 2016 | Oct. 18, 2016 |
4.50% Bonds Due April 26, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 563us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPointFivePercentBondsDueAprilTwentySixTwoThousandSeventeenMember | 737us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_FourPointFivePercentBondsDueAprilTwentySixTwoThousandSeventeenMember |
Debt interest rate | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPointFivePercentBondsDueAprilTwentySixTwoThousandSeventeenMember | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mck_FourPointFivePercentBondsDueAprilTwentySixTwoThousandSeventeenMember |
Debt maturity date | Apr. 26, 2017 | Apr. 26, 2017 |
Promissory Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_PromissoryNotesMember | 297us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mck_PromissoryNotesMember |
Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 117us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember | $ 166us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |
London Interbank Offered Rate (LIBOR) [Member] | Floating Rate Notes Due September 10, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt variable interest rate |  | 0.40%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_LongtermDebtTypeAxis = mck_FloatingRateNotesDueSeptemberTenthTwoThousandFifteenMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_FivePointSevenZeroPercentNotesDueMarchOneTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_FloatingRateNotesDueSeptemberTenthTwoThousandFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_FourPercentBondsDueOctoberEighteenTwoThousandSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_FourPointFivePercentBondsDueAprilTwentySixTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_OnePointTwoNinePercentNotesDueMarchTenthTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_OtherLongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_PromissoryNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_ThreePointTwoFivePercentNotesDueMarchOneTwoThousandSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_ZeroPointNineFivePercentNotesDueDecemberFourTwoThousandFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |