Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Estimated Annual Effective Tax Rate Used to Calculate Income Tax Expense (Benefit)			32.40%	22.60%
Federal statutory income tax rate, percent	21.00%		21.00%	21.00%
Income tax expense	$ 2,522,000	$ 2,248,000	$ 6,412,000	$ 3,869,000
Income before income taxes	$ 13,154,000	$ 9,622,000	$ 26,312,000	17,331,000
Effective income tax rate reconciliation, percent	19.20%	23.40%	24.40%		22.30%
Unrecognized tax benefits	$ 1,850,000	$ 2,071,000	$ 1,850,000	$ 2,071,000