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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2016
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, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 409,331 |  |  | $ | 446,163 |  |  | $ | 422,122 |
Less-net income and dividends attributable to participating restricted shares |  |  | (3,592 | ) |  |  | (4,597 | ) |  |  | (4,837 | )
Numerator for basic earnings per common share |  | $ | 405,739 |  |  | $ | 441,566 |  |  | $ | 417,285 |
Add-undistributed income allocated to participating restricted shares |  |  | 2,604 |  |  |  | 3,539 |  |  |  | 3,753 |
Less-undistributed income reallocated to participating restricted shares |  |  | (2,569 | ) |  |  | (3,485 | ) |  |  | (3,698 | )
Numerator for diluted earnings per common share |  | $ | 405,774 |  |  | $ | 441,620 |  |  | $ | 417,340 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding — basic |  |  | 149,168 |  |  |  | 154,423 |  |  |  | 159,012 |
Less-weighted average number of participating restricted shares |  |  | (1,309 | ) |  |  | (1,591 | ) |  |  | (1,822 | )
Weighted average number of common shares — basic |  |  | 147,859 |  |  |  | 152,832 |  |  |  | 157,190 |
Effect of assumed conversion of 0.5% convertible notes |  |  | 5 |  |  |  | 14 |  |  |  | 20 |
Effect of dilutive stock options granted |  |  | 2,002 |  |  |  | 2,372 |  |  |  | 2,334 |
Weighted average number of common shares — diluted |  |  | 149,866 |  |  |  | 155,218 |  |  |  | 159,544 |
Basic earnings per common share |  | $ | 2.74 |  |  | $ | 2.89 |  |  | $ | 2.65 |
Diluted earnings per common share |  | $ | 2.71 |  |  | $ | 2.85 |  |  | $ | 2.62 |

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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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