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Other Assets Schedule of Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2017 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Goodwill [Line Items] |  |  |  |
Goodwill |  | $ 154,055 | $ 160,414 | $ 150,115
Goodwill, Acquired During Period |  |  | 9,774 |
Goodwill, Translation Adjustments |  | 121 | 1,220 |
Goodwill, Impairment Loss | $ (5,500) | (5,542) |  |
Goodwill, Other Increase (Decrease) |  | 938 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | (695) |
Energy [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 552 | 552 | 552
Goodwill, Acquired During Period |  |  | 0 |
Goodwill, Translation Adjustments |  | 0 | 0 |
Goodwill, Impairment Loss |  | 0 |  |
Goodwill, Other Increase (Decrease) |  | 0 |  |
Ag [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 142,929 | 148,916 | 142,665
Goodwill, Acquired During Period |  |  | 5,726 |
Goodwill, Translation Adjustments |  | 121 | 1,220 |
Goodwill, Impairment Loss |  | (5,542) |  |
Goodwill, Other Increase (Decrease) |  | 566 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | (695) |
Corporate and Other [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 10,574 | 10,946 | $ 6,898
Goodwill, Acquired During Period |  |  | 4,048 |
Goodwill, Translation Adjustments |  | 0 | 0 |
Goodwill, Impairment Loss |  | 0 |  |
Goodwill, Other Increase (Decrease) |  | $ (372) |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | $ 0 |

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