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Quarterly Results Of Operations (Schedule of Of Quarterly Results) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Aug. 31, 2015 | May. 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | [1] | May. 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
Quarterly Results Of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 123,540 | [1] | $ 160,707 | $ 141,089 | $ 134,845 | $ 147,522 | $ 169,936 | $ 152,804 | $ 147,671 | $ 560,181 | $ 617,933 | $ 690,848
Cost of operating revenues | 90,075 | [1] | 114,321 | 101,533 | 97,931 | 107,599 | 121,687 | 110,132 | 107,520 | 403,860 | 446,938 | 496,014
Earnings before income taxes | 529 | [1] | 20,423 | 14,138 | 11,661 | 16,549 | 25,500 | 20,789 | 15,817 | 46,751 | 78,655 | 107,307
Net earnings | $ (3,181) | [1] | $ 12,927 | $ 8,995 | $ 7,568 | $ 11,329 | $ 16,499 | $ 13,450 | $ 10,234 | $ 26,309 | $ 51,512 | $ 70,570
Diluted net earnings per share | $ (0.28) | [1] | $ 1.10 | $ 0.75 | $ 0.62 | $ 0.89 | $ 1.28 | $ 1.04 | $ 0.79 | $ 2.22 | $ 4.00 | $ 5.47
Bad debt reserve on accounts receivable | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
Bad debt reserve against foreign income tax assets | $ 2,900 |  |  |  |  |  |  |  |  | $ 2,900 |  |
[1] | The fourth quarter 2015 results were impacted by a bad debt reserve of $5.0 million on accounts receivable and a reserve of $2.9 million against foreign income tax assets.

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