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Earnings Per Common Share (Tables) | 6 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Schedule of computations for basic and diluted earnings per common share | The computations for basic and diluted earnings per common share are as follows:
| Quarter Ended September 30, |  | Six Months Ended September 30,
(In millions, except per share amounts) | 2017 |  | 2016 |  | 2017 |  | 2016
Income from continuing operations | $ | 56 |  |  | $ | 325 |  |  | $ | 419 |  |  | $ | 998 |
Net income attributable to noncontrolling interests | (55 | ) |  | (17 | ) |  | (111 | ) |  | (35 | )
Income from continuing operations attributable to McKesson | 1 |  |  | 308 |  |  | 308 |  |  | 963 |
Income (loss) from discontinued operations, net of tax | — |  |  | (1 | ) |  | 2 |  |  | (114 | )
Net income attributable to McKesson | $ | 1 |  |  | $ | 307 |  |  | $ | 310 |  |  | $ | 849 |
Weighted average common shares outstanding: |  |  |  |  |  |  |
Basic | 209 |  |  | 226 |  |  | 210 |  |  | 226 |
Effect of dilutive securities: |  |  |  |  |  |  |
Options to purchase common stock | — |  |  | 1 |  |  | — |  |  | 1 |
Restricted stock units | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Diluted | 210 |  |  | 228 |  |  | 211 |  |  | 228 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |
Continuing operations | $ | 0.01 |  |  | $ | 1.35 |  |  | $ | 1.46 |  |  | $ | 4.22 |
Discontinued operations | — |  |  | (0.01 | ) |  | 0.01 |  |  | (0.50 | )
Total | $ | 0.01 |  |  | $ | 1.34 |  |  | $ | 1.47 |  |  | $ | 3.72 |
Basic |  |  |  |  |  |  |
Continuing operations | $ | 0.01 |  |  | $ | 1.36 |  |  | $ | 1.47 |  |  | $ | 4.27 |
Discontinued operations | — |  |  | — |  |  | 0.01 |  |  | (0.51 | )
Total | $ | 0.01 |  |  | $ | 1.36 |  |  | $ | 1.48 |  |  | $ | 3.76 |
(1) | Certain computations may reflect rounding adjustments.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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