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Share-Based Compensation (Tables) | 3 Months Ended
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Nov. 30, 2013
Share-Based Compensation [Abstract] |
Summary Of Type And Fair Value Of Share-Based Compensation Awards |
| Three months ended November 30,
| 2013 |  | 2012
|  |  | Grant-Date Fair Value |  |  |  | Grant-Date Fair Value
| # Granted |  | Per Award |  | # Granted |  | Per Award
Stock options | 25,394 |  | $ | 40.42 |  |  | 24,684 |  | $ | 40.09 |
RSUs | 29,619 |  | $ | 74.84 |  |  | 25,279 |  | $ | 74.31 |
PSUs | 13,434 |  | $ | 74.84 |  |  | 13,072 |  | $ | 74.31 |
Schedule Of Assumptions Used In Determining The Fair Value Of The Option Awards |
|  |  |  |  |  |  | Grant Year
|  |  |  |  |  |  | 2013 |  |  | 2012
Weighted-average dividend yield |  |  |  |  |  |  | 0.68% |  |  | 0.61%
Weighted-average volatility |  |  |  |  |  |  | 55.23% |  |  | 56.26%
Range of risk-free interest rates |  |  |  |  |  |  | 1.91% |  |  | 1.21%
Weighted-average expected lives |  |  |  |  |  |  | 7 years |  |  | 7 years

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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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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