Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Income Tax Contingency [Line Items]
Income tax expense	$ 166,000	$ 332,000	$ 207,000	$ 914,000
Income tax expense from discontinued operations	(100,000)	$ 19,000	(47,000)	$ 37,000
Unrecognized tax benefits that would impact effective tax rate	1,200,000		1,200,000		$ 1,300,000
Accrual for potential interest and penalties	$ 800,000		$ 800,000		$ 800,000
Minimum
Income Tax Contingency [Line Items]
Number of years open for tax examinations			3 years
Maximum
Income Tax Contingency [Line Items]
Number of years open for tax examinations			5 years