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Quarterly Results Of Operations (Schedule of Of Quarterly Results) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010
Quarterly Results Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 127,817 |  | $ 172,099 |  | $ 132,134 |  | $ 119,205 |  | $ 116,110 |  | $ 153,446 |  | $ 120,168 |  | $ 89,166 |  | $ 551,255 | $ 478,890 | $ 358,440
Cost of operating revenues | 95,069 |  | 123,071 |  | 95,640 |  | 88,957 |  | 86,056 |  | 111,947 |  | 86,159 |  | 64,943 |  | 402,737 | 349,105 | 259,540
Earnings before income taxes | 12,653 |  | 28,587 |  | 19,427 |  | 4,441 |  | 9,777 |  | 23,159 |  | 17,001 |  | 6,577 |  | 65,108 | 56,514 | 36,782
Net earnings | $ 8,759 |  | $ 18,823 |  | $ 12,774 |  | $ 2,921 |  | $ 5,902 |  | $ 15,289 |  | $ 11,325 |  | $ 4,286 |  | $ 43,277 | $ 36,802 | $ 24,862
Diluted net earnings per share | $ 0.68 | [1] | $ 1.47 | [1] | $ 1.00 | [1] | $ 0.23 | [1] | $ 0.46 | [1] | $ 1.20 | [1] | $ 0.89 | [1] | $ 0.34 | [1] | $ 3.38 | $ 2.90 | $ 1.98
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 74.62 |  | $ 70.13 |  | $ 67.27 |  | $ 63.40 |  | $ 73.03 |  | $ 85.87 |  | $ 79.56 |  | $ 66.48 |  | $ 74.62 | $ 73.03 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 52.68 |  | $ 52.98 |  | $ 49.17 |  | $ 46.03 |  | $ 47.68 |  | $ 61.85 |  | $ 58.00 |  | $ 37.22 |  | $ 52.68 | $ 47.68 |
[1] | The quarterly diluted net earnings per share is calculated based on the weighted average shares outstanding assuming dilution for the quarter. There may be rounding differences between the sum of the quarterly diluted net earnings per share amounts and the year-to-date diluted net earnings per share.

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