Inventories - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Inventory [Line Items]
Casualty loss due to Hurricane	$ 14,900,000
Proceeds from federal relief grants	1,123,000	$ 4,299,000	$ 4,629,000
Year-End Adjustment
Inventory [Line Items]
Inventory casualty loss	$ 6,676,000