Annual report pursuant to Section 13 and 15(d)

Inventories - Narrative (Details)

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Inventories - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Inventory [Line Items]        
Proceeds from federal relief grants $ 15,597,000,000 $ 4,629,000 $ 15,597,000  
Proceeds received from insurance relating to property and casualty damage claims $ 486,000,000   486,000  
Property and Casualty Claims        
Inventory [Line Items]        
Insurance proceeds received       $ 477,000
Crop Claims        
Inventory [Line Items]        
Insurance proceeds received       $ 8,952,000
Year-End Adjustment        
Inventory [Line Items]        
Inventory casualty loss     $ 808,000