Quarterly report pursuant to Section 13 or 15(d)

Inventories - Narrative (Details)

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Inventories - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Inventory [Line Items]        
Proceeds received from insurance relating to property and casualty damage claims     $ 486  
Proceeds from federal relief grants $ 4,466 $ 15,597    
Property and Casualty Claims        
Inventory [Line Items]        
Insurance proceeds received       $ 477
Crop Claims        
Inventory [Line Items]        
Insurance proceeds received       $ 8,952