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Share-Based Payments (Tables) | 3 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted Stock Activity | The transactions for restricted stock for the three months ended December 31, 2017 were as follows:
| Shares |  | Weighted- average Grant-date Fair Value
Non-vested at September 30, 2017 | 501,184 |  |  | $ | 53.65 |
Granted | 234,100 |  |  | 57.05 |
Vested | (168,280 | ) |  | 51.54 |
Expired or forfeited | (5,214 | ) |  | 59.51 |
Non-vested at December 31, 2017 | 561,790 |  |  | $ | 55.64 |
Assumptions used in Estimating Fair Value | The following table indicates the assumptions used in estimating the fair value of restricted stock granted during the three-month periods ended December 31, 2017 and 2016.
| Three Months Ended December 31,
| 2017 |  | 2016
Expected volatility | 20.5 | % |  | 20.2 | %
Dividend yield | 1.0 | % |  | 1.1 | %
Average risk-free interest rate | 2.0 | % |  | 1.7 | %
Average expected term (years) | 2.1 |  |  | 2.1 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted stock, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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