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Earnings Per Common Share | 12 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share Basic earnings per common share attributable to McKesson are computed by dividing net income attributable to McKesson by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per common share are computed similar to basic earnings per common share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. The computations for basic and diluted earnings per common share are as follows:
| Years Ended March 31,
(In millions, except per share amounts) | 2015 |  | 2014 |  | 2013
Income from continuing operations | $ | 1,842 |  |  | $ | 1,414 |  |  | $ | 1,363 |
Net loss (income) attributable to noncontrolling interests | (67 | ) |  | 5 |  |  | — |
Income from continuing operations attributable to McKesson | 1,775 |  |  | 1,419 |  |  | 1,363 |
Loss from discontinued operations, net of tax | (299 | ) |  | (156 | ) |  | (25 | )
Net income attributable to McKesson | $ | 1,476 |  |  | $ | 1,263 |  |  | $ | 1,338 |
Weighted average common shares outstanding: |  |  |  |  |
Basic | 232 |  |  | 229 |  |  | 235 |
Effect of dilutive securities: |  |  |  |  |
Options to purchase common stock | 1 |  |  | 1 |  |  | 1 |
Restricted stock units | 2 |  |  | 3 |  |  | 3 |
Diluted | 235 |  |  | 233 |  |  | 239 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |  |  |
Diluted |  |  |  |  |
Continuing operations | $ | 7.54 |  |  | $ | 6.08 |  |  | $ | 5.69 |
Discontinued operations | (1.27 | ) |  | (0.67 | ) |  | (0.10 | )
Total | $ | 6.27 |  |  | $ | 5.41 |  |  | $ | 5.59 |
Basic |  |  |  |  |
Continuing operations | $ | 7.66 |  |  | $ | 6.19 |  |  | $ | 5.81 |
Discontinued operations | (1.29 | ) |  | (0.68 | ) |  | (0.10 | )
Total | $ | 6.37 |  |  | $ | 5.51 |  |  | $ | 5.71 |
(1) | Certain computations may reflect rounding adjustments.
Potentially dilutive securities include outstanding stock options, restricted stock units, and performance-based and other restricted stock units. Approximately 1 million, 2 million and 2 million of potentially dilutive securities were excluded from the computations of diluted net earnings per common share in 2015, 2014 and 2013, as they were anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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