Quarterly report pursuant to Section 13 or 15(d)

Inventories - Narrative (Details)

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Inventories - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]          
Proceeds from federal relief grants $ 163,000 $ 4,299,000 $ 15,597,000 $ 4,629,000 $ 4,466,000