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Shared-Based Compensation (Tables) | 3 Months Ended
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Nov. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary Of Type And Fair Value Of Share-Based Compensation Awards | The following table illustrates the type and fair value of the share-based compensation awards granted during the three-month periods ended November 30, 2018 and November 30, 2017:
|  | Three months ended |
|  | November 30, 2018 |  |  | November 30, 2017 |
|  | Number of units granted |  |  | Weighted average grant-date fair value per award |  |  | Number of units granted |  |  | Weighted average grant-date fair value per award |
Stock options |  |  | 38,337 |  |  | $ | 24.71 |  |  |  | 44,312 |  |  | $ | 30.73 |
RSUs |  |  | 29,013 |  |  | $ | 88.27 |  |  |  | 69,198 |  |  | $ | 87.06 |
PSUs |  |  | 20,631 |  |  | $ | 88.27 |  |  |  | 14,854 |  |  | $ | 88.06 |
Schedule Of Assumptions Used | The following table provides the assumptions used in determining the fair value of the stock options awarded during the three-month periods ended November 30, 2018 and November 30, 2017:
|  | Grant Year |
|  | 2018 |  |  | 2017 |
Weighted-average dividend yield |  |  | 1.4 | % |  |  | 1.3 | %
Weighted-average volatility |  |  | 26.3 | % |  |  | 34.0 | %
Risk-free interest rate |  |  | 3.1 | % |  |  | 2.2 | %
Weighted-average expected lives |  | 6 years |  |  | 7 years |

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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