Income Taxes - Narrative (Details)	6 Months Ended
Mar. 31, 2021 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Increase resulting from prior period tax positions	$ 605,000
Increase in income tax benefit due to difference in federal income tax rate	$ 82,000

Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

Name:	us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration