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Stock-based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block] |
| Year Ended September 30, 2017
Risk-free interest rate | 1.40%
Expected volatility of the Company's stock | 21.00%
Assumptions Used in Black-Scholes Option Valuation Model |
| Year Ended September 30,
| 2017 |  | 2016 |  | 2015
Expected life of option (years) | 4.75 & 6.5 |  | 6.4 |  | 6.6
Risk-free interest rate | 1.23% - 1.93% |  | 1.64% - 1.70% |  | 1.61% - 1.93%
Expected volatility of the Company’s stock | 24.60% |  | 36.00% |  | 36.00%
Expected dividend yield on the Company’s stock | 2.21% |  | 2.11% |  | 2.02%
Summary of Stock Option Activity | A summary of stock option activity at September 30, 2017, and changes for the year then ended, is presented below:
| Weighted Average Option Price |  | Shares Subject to Option |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (in millions)
Outstanding, September 30, 2016 | $ | 32.07 |  |  | 22,332,233 |  |  |  |  |
Spin conversion | 31.02 |  |  | 1,547,096 |  |  |  |  |
Granted | 41.73 |  |  | 2,841,686 |  |  |  |  |
Exercised | 28.33 |  |  | (5,919,790 | ) |  |  |  |
Forfeited or expired | 42.33 |  |  | (1,070,782 | ) |  |  |  |
Outstanding, September 30, 2017 | $ | 32.76 |  |  | 19,730,443 |  |  | 4.9 |  | $ | 187 |
Exercisable, September 30, 2017 | $ | 33.16 |  |  | 15,054,034 |  |  | 4.0 |  | $ | 180 |
Assumptions Used in Black-Scholes Stock Appreciation Rights Valuation Model | The assumptions used to determine the fair value of the SAR awards at September 30, 2017 were as follows:
Expected life of SAR (years) | 0.5 - 5.5
Risk-free interest rate | 1.06% - 1.98%
Expected volatility of the Company’s stock | 24.60%
Expected dividend yield on the Company’s stock | 2.21%
Summary of Stock Appreciation Rights Activity | A summary of SAR activity at September 30, 2017, and changes for the year then ended, is presented below:
| Weighted Average SAR Price |  | Shares Subject to SAR |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (in millions)
Outstanding, September 30, 2016 | $ | 30.49 |  |  | 1,201,165 |  |  |  |  |
Spin conversion | 28.06 |  |  | 29,241 |  |  |  |  |
Granted | 41.73 |  |  | 15,693 |  |  |  |  |
Exercised | 29.62 |  |  | (290,378 | ) |  |  |  |
Forfeited or expired | 39.17 |  |  | (62,410 | ) |  |  |  |
Outstanding, September 30, 2017 | $ | 27.02 |  |  | 893,311 |  |  | 3.8 |  | $ | 12 |
Exercisable, September 30, 2017 | $ | 26.40 |  |  | 853,260 |  |  | 3.5 |  | $ | 12 |
Summary of Nonvested Restricted Stock Awards | A summary of the status of the Company’s nonvested restricted stock awards at September 30, 2017, and changes for the fiscal year then ended, is presented below:
| Weighted Average Price |  | Shares/Units Subject to Restriction
Nonvested, September 30, 2016 | $ | 47.27 |  |  | 9,566,044 |
Spin conversion | 43.88 |  |  | 482,312 |
Granted | 41.66 |  |  | 1,773,465 |
Vested | 40.83 |  |  | (3,045,375 | )
Forfeited | 44.53 |  |  | (1,814,740 | )
Nonvested, September 30, 2017 | $ | 44.48 |  |  | 6,961,706 |
Summary of Nonvested PSUs | A summary of the status of the Company’s nonvested PSUs at September 30, 2017, and changes for the fiscal year then ended, is presented below:
| Weighted Average Price |  | Shares/Units Subject to PSU
Nonvested, September 30, 2016 | $ | — |  |  | — |
Granted | 43.43 |  |  | 1,259,342 |
Forfeited | 44.98 |  |  | (139,954 | )
Nonvested, September 30, 2017 | $ | 43.24 |  |  | 1,119,388 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards 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 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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -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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