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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