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Share-Based Payments (Tables) | 6 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted Stock Activity | The transactions for restricted stock for the six months ended March 31, 2017 were as follows:
| Shares |  | Weighted- average grant-date fair value
Non-vested at September 30, 2016 | 522,710 |  |  | $ | 45.10 |
Granted | 216,655 |  |  | 66.61 |
Vested | (185,180 | ) |  | 47.24 |
Expired or forfeited | (6,950 | ) |  | 50.29 |
Non-vested at March 31, 2017 | 547,235 |  |  | $ | 52.83 |
Stock Option Activity | The transactions for shares under options for the six months ended March 31, 2017 were as follows:
| Shares |  | Weighted- average exercise price |  | Weighted- average remaining contractual term |  | Aggregate intrinsic value
Outstanding, September 30, 2016 | 77,733 |  |  | $ | 40.56 |  |  |  |  |
Exercised | (333 | ) |  | 40.56 |  |  |  |  |
Expired or forfeited | (77,400 | ) |  | 40.56 |  |  |  |  |
Outstanding, March 31, 2017 | — |  |  | — |  |  | — |  |  | $ | — |
Exercisable, March 31, 2017 | — |  |  | $ | — |  |  | — |  |  | $ | — |
Non-vested Options Activity | The transactions for non-vested options for the six-months ended March 31, 2017 were as follows:
|  |  | Weighted-average grant-date
| Shares |  | fair value
Non-vested at September 30, 2016 | 77,400 |  |  | $ | 12.29 |
Expired or forfeited | (77,400 | ) |  | 12.29 |
Non-vested at March 31, 2017 | — |  |  | $ | — |
Assumptions used in Estimating Fair Value | The following table indicates the assumptions used in estimating the fair value of restricted stock granted during the six-month periods ended March 31, 2017 and 2016.
| Six Months Ended March 31,
| 2017 |  | 2016
Expected volatility | 20.2 | % |  | 20.7 | %
Dividend yield | 1.1 | % |  | 1.0 | %
Average risk-free interest rate | 1.7 | % |  | 1.7 | %
Average expected term (years) | 2.1 |  |  | 2.1 |

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- Definition Disclosure of the number and weighted-average grant date fair value for non-vested stock options that were outstanding at the beginning and end of the year, and the number of non-vested stock options that were granted, vested, or forfeited during the year. + References No definition available. + Details
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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 Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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