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Stock-based Compensation (Tables) | 12 Months Ended
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Aug. 31, 2020
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, 2019 |  | 96,920 |  | $ | 86.01 |  |  |
Granted |  | 18,438 |  | $ | 184.43 |  |  |
Converted to common shares |  | (29,055) |  | $ | 88.24 |  |  |
Forfeited |  | (149) |  | $ | 156.83 |  |  |
Outstanding at August 31, 2020 |  | 86,154 |  | $ | 106.20 |  | $ | 17,608
Vested at August 31, 2020 |  | 60,689 |  | $ | 83.15 |  | $ | 12,404
Market Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Valuation Assumptions |
| Fiscal Year Ended August 31,
| 2020 |  | 2019 |  | 2018
Expected volatility |  | 21.4% |  |  | 19.6% |  |  | 20.4%
Risk-free interest rate |  | 1.4% |  |  | 3.0% |  |  | 1.6%
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, 2019 |  | 39,524 |  | $ | 121.03 |  |  |
Granted |  | 13,452 |  | $ | 216.77 |  |  |
Performance factor adjustments |  | 10,561 |  | $ | 96.10 |  |  |
Converted to common shares |  | (24,171) |  | $ | 93.69 |  |  |
Forfeited |  | (248) |  | $ | 118.47 |  |  |
Outstanding at August 31, 2020 (1) |  | 39,118 |  | $ | 164.14 |  | $ | 7,995
(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, 2019 |  | 23,530 |  | $ | 148.70 |  |  |
Granted |  | 18,955 |  | $ | 183.62 |  |  |
Performance factor adjustments |  | (19,357) |  | $ | 160.37 |  |  |
Converted to common shares |  | - |  | $ | - |  |  |
Forfeited |  | (214) |  | $ | 183.62 |  |  |
Outstanding at August 31, 2020 |  | 22,914 |  | $ | 167.40 |  | $ | 4,683
Vested at August 31, 2020 |  | 4,173 |  | $ | 94.54 |  | $ | 853

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