Income Taxes (Summary of Changes in Valuation Allowances for Deferred Tax Assets) (Details) $ in Thousands	9 Months Ended
Jun. 30, 2022 USD ($)
Deferred Tax Assets [Abstract]
Balance at October 1, 2021	$ 57,645
Adjustment Related to Sale of California Assets and Current Year Activity	(28,747)
Balance at June 30, 2022	$ 28,898

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant