Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
Sep. 30, 2021	Sep. 30, 2017
Income Taxes [Line Items]
Deferred tax asset	$ 700,000
Domestic Country
Income Taxes [Line Items]
Net operating loss (NOL) carryforwards	$ 11,400,000	$ 0
Minimum [Member] \| State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards expiration year	2029
Maximum [Member] \| State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards expiration year	2032

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319

Name:	us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant