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Trade Accounts and Financing Receivables - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Sep. 30, 2020
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Promissory notes receivable maturity month and year |  |  |  | 2023-01 |
Value of notes with customer | $ 8,682,000 |  |  | $ 8,682,000 | $ 184,000
Term of sales-type lease | 6 months |  |  | 6 months |
Future minimum lease payments | $ 3,000,000.0 |  |  | $ 3,000,000.0 |
Future minimum lease payments of unearned income | 31,000 |  |  | 31,000 |
Future minimum lease payments due in fiscal year 2021 | 2,000,000.0 |  |  | 2,000,000.0 |
Future minimum lease payments due in fiscal year 2022 | 1,000,000.0 |  |  | 1,000,000.0 |
Interest income related to lease | $ 12,000 |  |  | $ 12,000 |
Secured Promissory Note |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Value of notes with customer |  |  | $ 10,000,000.0 |  |
Term of the notes |  |  | 3 years |  |
Monthly principal and interest payments |  |  | $ 300,000 |  |
Frequency of payments |  |  | monthly | monthly |
Short-Term Promissory Note |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Value of notes with customer |  | $ 13,200,000 |  |  |
Interest rate of the notes |  | 5.00% |  |  |
Maturity date |  | Mar. 31, 2021 |  |  |
Manufactured Rental Equipment |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Promissory notes receivable maximum interest rate | 8.00% |  |  | 8.00% |
Product |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Partially financed product sale |  |  | $ 12,500,000 |  |

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