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Other Assets - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2018 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Mar. 01, 2019
Goodwill [Line Items] |  |  |  |  |
Goodwill, Acquired During Period |  | $ 61,358,000 |  |  |
Remainingownershipacquired |  |  |  |  | 75.00%
Goodwill |  | 172,404,000 | $ 138,464,000 | $ 138,454,000 |
Goodwill impairment, result of annual impairment analysis | $ 0 |  |  |  |
Goodwill impairment charge | $ 0 | 27,418,000 |  |  |
Amortization of intangible assets |  | 5,300,000 | 3,400,000 | 4,300,000 |
Ag |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Acquired During Period |  | 61,358,000 |  |  |
Goodwill |  | 161,278,000 | $ 127,338,000 | $ 127,328,000 |
Goodwill impairment charge |  | 27,418,000 |  |  |
Nitrogen Production |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | $ 0 |  |  |
Minimum | Other Intangible Assets |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible asset useful lives |  | 2 years |  |  |
Maximum | Other Intangible Assets |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible asset useful lives |  | 30 years |  |  |

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