Accounts and Long Term Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 13,362	$ 15,114
Long-term receivable	$ 3,642	5,328
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term of accounts and long term receivables	1 year
Financing receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,300	2,100
Long-term receivable	$ 3,500	5,000
Long term receivables interest rate	6.10%
Amount of allowance for credit losses or impairments with a contractual maturity of over one year	$ 0	0
Accounts and long-term receivable past due	0	0
Activity in allowance for credit losses for accounts and long-term receivables	0	0
Contract Receivable, Fiscal Year Maturity [Abstract]
2021	2,678
2022	2,300
2023	1,423
Total payments	6,401
Less: unearned income	562
Total, net of unearned income	$ 5,839
Financing receivables | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term of accounts and long term receivables	1 year
Financing receivables | Other Income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts And Long Term Receivable, Interest Income	$ 453	$ 75