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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2019
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, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 479,446 |  |  | $ | 354,396 |  |  | $ | 436,826 |
Net income and dividends attributable to participating restricted shares |  |  | (3,295 | ) |  |  | (2,650 | ) |  |  | (3,517 | )
Numerator for basic earnings per common share |  | $ | 476,151 |  |  | $ | 351,746 |  |  | $ | 433,309 |
Undistributed income allocated to participating restricted shares |  |  | 2,252 |  |  |  | 1,617 |  |  |  | 2,512 |
Undistributed income reallocated to participating restricted shares |  |  | (2,240 | ) |  |  | (1,603 | ) |  |  | (2,488 | )
Numerator for diluted earnings per common share |  | $ | 476,163 |  |  | $ | 351,760 |  |  | $ | 433,333 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding — basic |  |  | 137,418 |  |  |  | 142,422 |  |  |  | 146,017 |
Weighted average number of participating restricted shares |  |  | (944 | ) |  |  | (1,065 | ) |  |  | (1,176 | )
Weighted average number of common shares — basic |  |  | 136,474 |  |  |  | 141,357 |  |  |  | 144,841 |
Effect of dilutive stock options granted |  |  | 691 |  |  |  | 1,282 |  |  |  | 1,414 |
Weighted average number of common shares — diluted |  |  | 137,165 |  |  |  | 142,639 |  |  |  | 146,255 |
Basic earnings per common share |  | $ | 3.49 |  |  | $ | 2.49 |  |  | $ | 2.99 |
Diluted earnings per common share |  | $ | 3.47 |  |  | $ | 2.47 |  |  | $ | 2.96 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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