Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Tax Credit Carryforward [Line Items]
Income tax rate	26.20%	27.00%
Uncertain tax positions	$ 0
Tax Year 2020 \| US
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2020
Tax Year 2020 \| State
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2020
Tax Year 2019 \| US
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2019
Tax Year 2019 \| State
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2019
Tax Year 2018 \| US
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2018
Tax Year 2018 \| State
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2018
Tax Year 2017 \| US
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2017
Tax Year 2017 \| State
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2017
Tax Year 2016 \| State
Tax Credit Carryforward [Line Items]
Income tax subject to audit	2016