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, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds received from insurance relating to property and casualty damage claims $ 486     $ 486  
Proceeds from federal relief grants 15,597     $ 15,597  
Pension expense 935        
Gain on sale of assets $ 13,166        
Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds received from insurance relating to property and casualty damage claims     $ 477    
Proceeds from insurance settlement, 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 | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Insurance proceeds received   $ 5,226