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Capitalized Software Held for Sale, Net (Tables) | 12 Months Ended
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Mar. 31, 2016
Capitalized Computer Software, Net [Abstract] |
Schedule of changes in the carrying amount of capitalized software held for sale, net | Changes in the carrying amount of capitalized software held for sale, net, which is included in other assets in the consolidated balance sheets, were as follows:
| Years Ended March 31,
(In millions) | 2016 |  | 2015 |  | 2014
Balance, at beginning of period | $ | 91 |  |  | $ | 103 |  |  | $ | 126 |
Amounts capitalized | 30 |  |  | 34 |  |  | 40 |
Amortization expense | (37 | ) |  | (40 | ) |  | (50 | )
Impairment charges | — |  |  | — |  |  | (12 | )
Disposal | (5 | ) |  | — |  |  | — |
Foreign currency translations adjustments, net | (1 | ) |  | (6 | ) |  | (1 | )
Balance, at end of period | $ | 78 |  |  | $ | 91 |  |  | $ | 103 |

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- Definition Capitalized Software Held for Sale [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | mck_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration