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Income Taxes - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Nov. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020
Income taxes
Penalties and interest accrual		$ 69,000,000
Penalties and interest expense		6,000,000
Unrecognized, period increase (decrease)		679,000,000
Additional interest expense accrued		6,000,000
Income Tax Expense (Benefit)		348,000	$ 329,000
Internal Revenue Service \| Tax Year 2017
Income taxes
Examination, interest expense		97,000
Payments for taxes		$ 399,000
Internal Revenue Service \| Tax Year 2017 \| Subsequent Event
Income taxes
Penalties and interest expense	$ 68,000
Internal Revenue Service \| Domestic Tax Authority \| Tax Year 2016
Income taxes
Provision for incremental Income tax liability				$ 762,000
Internal Revenue Service \| State Jurisdiction \| Tax Year 2016
Income taxes
Provision for incremental Income tax liability				$ 70,000