Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (unaudited) - Narrative (Details)

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Selected Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Inventory casualty loss and net realizable value adjustment     $ 14,688    
Impairments of long-lived assets     $ 9,346    
Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment loss   $ 1,855     $ 5,215
Proceeds received from property and casualty damage claims   477      
Proceeds received from crop claims   $ 3,726      
Crop Claims          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Insurance proceeds received       $ 8,952  
Crop Claims | Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Insurance proceeds received $ 5,226