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Trade Accounts and Financing Receivables - Financing Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
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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)

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