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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation, Activity [Table Text Block] | A summary of the stock-based awards granted during the six month periods ended March 31, 2019 and 2018 is presented below:
| Six Months Ended March 31,
| 2019 |  | 2018
| Number Granted |  | Weighted Average Grant Date Fair Value |  | Number Granted |  | Weighted Average Grant Date Fair Value
Stock options | 1,741,510 |  |  | $ | 5.56 |  |  | 1,355,595 |  |  | $ | 7.05 |
Restricted stock/units | 2,307,864 |  |  | 33.43 |  |  | 2,095,225 |  |  | 37.37 |
Performance shares | 583,989 |  |  | 36.28 |  |  | 496,478 |  |  | 36.31 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| Six Months Ended March 31,
| 2019 |  | 2018
Expected life of option (years) | 6.4 |  | 6.5
Risk-free interest rate | 2.77% |  | 2.28%
Expected volatility of the Company’s stock | 21.8% |  | 23.7%
Expected dividend yield on the Company’s stock | 3.29% |  | 2.78%
Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block] |
| Six Months Ended March 31,
| 2019 |  | 2018
Risk-free interest rate | 2.76% |  | 1.92%
Expected volatility of the Company’s stock | 22.9% |  | 21.7%

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- Definition Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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