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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Industrial development revenue bonds	$ 400	$ 800
Less: current portion	(400)	(400)
Total long-term debt	$ 0	$ 400

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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