Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Income Tax Contingency [Line Items]
Income tax expense	$ 490,000	$ 166,000	$ 570,000	$ 207,000
Benefit related to reversal of previously recorded uncertain tax positions			300,000
Income tax expense from discontinued operations		$ (100,000)		$ (47,000)
Unrecognized tax benefits that would impact effective tax rate	900,000		900,000		$ 1,200,000
Accrual for potential interest and penalties	$ 600,000		$ 600,000		$ 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