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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share:
|  | Year Ended September 30, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic and diluted earnings per share |  | $ | 441,596 |  |  | $ | 422,122 |  |  | $ | 412,439 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share — weighted average number of shares outstanding |  |  | 152,832 |  |  |  | 159,012 |  |  |  | 161,330 |
Effect of assumed conversion of 0.50% convertible notes |  |  | 14 |  |  |  | 20 |  |  |  | 24 |
Effect of dilutive stock options granted |  |  | 2,372 |  |  |  | 2,334 |  |  |  | 1,764 |
Denominator for dilutive earnings per share — adjusted weighted average shares and assumed conversions |  |  | 155,218 |  |  |  | 161,366 |  |  |  | 163,118 |
Basic earnings per share |  | $ | 2.89 |  |  | $ | 2.65 |  |  | $ | 2.56 |
Diluted earnings per share |  | $ | 2.85 |  |  | $ | 2.62 |  |  | $ | 2.53 |

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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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