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Stock-based Compensation (Tables) | 12 Months Ended
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Aug. 31, 2019
Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Restricted Stock Units Activity |
|  |  | Weighted-Average |  |
|  |  | Grant Date |  |
| Number of |  | Fair Value |  | Aggregate
Restricted Stock Units | Shares |  | Per Share |  | Intrinsic Value
Outstanding at August 31, 2018 |  | 115,308 |  | $ | 70.52 |  |  |
Granted |  | 17,562 |  | $ | 163.93 |  |  |
Converted to common shares |  | (35,813) |  | $ | 74.19 |  |  |
Forfeited |  | (137) |  | $ | 130.99 |  |  |
Outstanding at August 31, 2019 |  | 96,920 |  | $ | 86.01 |  | $ | 17,669
Vested at August 31, 2019 |  | 72,069 |  | $ | 70.34 |  | $ | 13,138
Market Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Valuation Assumptions |
| Fiscal Year Ended August 31,
| 2019 |  | 2018 |  | 2017
Expected volatility |  | 19.6% |  |  | 20.4% |  |  | 21.1%
Risk-free interest rate |  | 3.0% |  |  | 1.6% |  |  | 1.0%
Expected dividend yield |  | 0.0% |  |  | 0.0% |  |  | 0.0%
Schedule Of Market Share Units Activity |
|  |  | Weighted-Average |  |
|  |  | Grant Date |  |
| Number of |  | Fair Value |  | Aggregate
Market Share Units | Shares |  | Per Share |  | Intrinsic Value
Outstanding at August 31, 2018 |  | 42,208 |  | $ | 105.81 |  |  |
Granted |  | 11,687 |  | $ | 177.82 |  |  |
Performance factor adjustments |  | 11,090 |  | $ | 127.80 |  |  |
Converted to common shares |  | (24,752) |  | $ | 125.28 |  |  |
Forfeited |  | (709) |  | $ | 108.29 |  |  |
Outstanding at August 31, 2019 (1) |  | 39,524 |  | $ | 121.03 |  | $ | 7,205
(1)This figure represents the total number of shares underlying MSU grants assuming achievement of the target number of shares at 100%. As the ultimate number of shares that vest could be as high as 200% of the target, the Company may be required to issue additional shares to satisfy outstanding MSU award grants.
Deferred Performance Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Deferred Performance Share Units |
|  |  |  | Weighted-Average |  |  |
|  |  | Grant Date |  |
| Number of |  | Fair Value |  | Aggregate
Deferred Performance Units | Shares |  | Per Share |  | Intrinsic Value
Outstanding at August 31, 2018 |  | 30,768 |  | $ | 108.14 |  |  |
Granted |  | 20,043 |  | $ | 160.37 |  |  |
Performance factor adjustments |  | (25,966) |  | $ | 110.65 |  |  |
Converted to common shares |  | (629) |  | $ | 94.54 |  |  |
Forfeited |  | (686) |  | $ | 160.37 |  |  |
Outstanding at August 31, 2019 |  | 23,530 |  | $ | 148.70 |  | $ | 4,290
Vested at August 31, 2019 |  | 4,173 |  | $ | 94.54 |  | $ | 761

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