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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Numerator and denominator used to compute basic and diluted earnings (loss) per share | The following table sets forth the numerators and denominators used in the computation of basic and diluted earnings per share. Stock options to purchase 7.3 million shares of common stock were excluded from the computation of diluted earnings per share for fiscal 2015 because their effect would have been antidilutive.
| Year Ended September 30,
| 2017 |  | 2016 |  | 2015
| (In millions)
Numerator: |  |  |  |  |
Net income | $ | 1,038.4 |  |  | $ | 886.3 |  |  | $ | 750.7 |
Denominator: |  |  |  |  |
Denominator for basic earnings per share — weighted average common shares | 374.3 |  |  | 371.0 |  |  | 366.3 |
Effect of dilutive securities: |  |  |  |  |
Employee stock awards | 4.6 |  |  | 4.1 |  |  | 3.5 |
Denominator for diluted earnings per share — adjusted weighted average common shares | 378.9 |  |  | 375.1 |  |  | 369.8 |
Basic net income per common share | $ | 2.77 |  |  | $ | 2.39 |  |  | $ | 2.05 |
Net income per common share assuming dilution | $ | 2.74 |  |  | $ | 2.36 |  |  | $ | 2.03 |

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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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