Trade Accounts and Financing Receivables - Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	$ 10,613	$ 7,896
Total unearned income		(6)
Total financing receivables, net of unearned income	10,613	7,890
Less current portion	(8,507)	(4,952)
Non-current notes receivable	2,106	2,938
Promissory Notes
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	9,132	5,432
Sales-type Lease
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	$ 1,481	2,464
Total unearned income		$ (6)