Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Contingency [Line Items]
Statutory tax rate based on blended rate calculation	21.00%	21.00%	21.00%
(Reductions) additions to valuation allowance	$ 1,559,000	$ (2,167,000)
Operating loss carryforwards, annual utilization limits	$ 800,000
Operating loss carryforwards, utilization limit, percent	80.00%
Unrecognized tax benefits that would impact effective tax rate	$ 300,000
Net (benefit) expense for interest and penalties	(100,000)	4,000	$ 100,000
Cumulative accrual for potential interest and penalties	$ 600,000	800,000
Maximum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	5 years
Operating loss carry forwards expiration year	2035
Minimum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	3 years
Operating loss carry forwards expiration year	2031
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 13,000,000.0
Net operating loss carryforwards with indefinite carryforward period	84,000,000.0
Foreign Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforwards	0
Tax credit carryforwards	$ 1,200,000
Foreign Tax Authority | Maximum
Income Tax Contingency [Line Items]
Tax credit carry forwards expiration year	2031
Foreign Tax Authority | Minimum
Income Tax Contingency [Line Items]
Tax credit carry forwards expiration year	2030
State Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 22,000,000.0
SoLayTec
Income Tax Contingency [Line Items]
Income tax expense (benefit) from discontinued operations			$ (1,300,000)
Tempress
Income Tax Contingency [Line Items]
Income tax expense (benefit) from discontinued operations		(11,100,000)
R2D
Income Tax Contingency [Line Items]
Income tax expense (benefit) from discontinued operations		$ 200,000