Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Allowance For Doubtful Accounts Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		$ 101
Charged to costs and expenses	[1]	347	241	106
Deductions	[2]	(187)	(140)	(106)
Balance at end of year		261	101
SEC Schedule, 12-09, Allowance, Notes Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year
Charged to costs and expenses	[1]	602
Deductions	[2]	(420)
Balance at end of year		182
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	[3]
Charged to costs and expenses	[1],[3]	1,273
Deductions	[2],[3]
Balance at end of year	[3]	$ 1,273

[1] Charged to bad debts expense (under other selling, general and administrative expenses) in the consolidated statements of operations.

[2] Written off against gross receivable and allowance.

[3] Included in deferred tax liability, net in the consolidated balance sheets.