Trade Accounts Receivable and Financing Receivables - Additional Information (Details) - USD ($)		3 Months Ended			9 Months Ended		12 Months Ended
	May 26, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2018	Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable		$ 14,874,000			$ 14,874,000				$ 25,144,000
Value of notes with customer		$ 939,000			$ 939,000				3,472,000
Promissory notes receivable maturity month and year					2023-01
Term of sales-type lease		3 years			3 years
Future minimum lease payments		$ 700,000			$ 700,000
Future minimum lease payments of unearned income		5,000			5,000
Interest income earned on lease		$ 10,000		$ 100,000	$ 38,000	$ 100,000
Manufactured Rental Equipment
Accounts Notes And Loans Receivable [Line Items]
Promissory notes receivable maximum interest rate		7.00%			7.00%
Product
Accounts Notes And Loans Receivable [Line Items]
Partially financed product sale			$ 12,500,000
Secured Promissory Note
Accounts Notes And Loans Receivable [Line Items]
Interest rate of the notes			7.00%
Frequency of payments			monthly		monthly
Value of notes with customer			$ 10,000,000.0
Term of the notes			3 years
Monthly principal and interest payments			$ 300,000
Marketable Debt Securities
Accounts Notes And Loans Receivable [Line Items]
Transition of unpaid invoices and late fee into debt securities	$ 13,000
Term of debt securities	24 months
Interest rate of the notes	8.00%
Frequency of payments					bi-annual interest and principal payments
Premium interest rate for paid in kind payments					10.00%
Maturity date of debt securities					Jul. 14, 2022
Scenario Forecast
Accounts Notes And Loans Receivable [Line Items]
Reversal of operating lease receivable and rental revenue							$ 8,000,000.0
Single Customer
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable		$ 14,000,000.0			$ 14,000,000.0
Unrecognized rental revenue and late payment penalties					5,700,000
Proceeds from contract customers					6,200,000
Revenue recognized		3,600,000
Received cash payment in excess								$ 24,000,000
Single Customer | Trade Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable		$ 8,300,000			$ 8,300,000				$ 8,500,000