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Revenue Recognition (Summary of Impacts of ASU on Condensed Consolidated Statement of Earnings) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Statement of Earnings |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 101,885 | $ 121,054 | $ 109,182 | $ 111,951 | $ 123,269 | $ 169,571 | $ 130,339 | $ 124,526 | $ 444,072 | $ 547,705 | $ 517,985
Operating income |  |  |  |  |  |  |  |  | 6,115 | $ 39,012 | $ 40,649
ASC Topic 606 Adjustments [Member] | ASC Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Statement of Earnings |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (6,359) |  |
Operating income |  |  |  |  |  |  |  |  | (3,410) |  |
Balance Without Adoption of ASC Topic 606 [Member] | ASC Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Statement of Earnings |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 437,713 |  |
Operating income |  |  |  |  |  |  |  |  | $ 2,705 |  |

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