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Senior Notes - Additional Information (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Dec. 06, 2019	May 08, 2018
Debt Disclosure [Line Items]
Debt issuance costs	$ 9,000,000.0	$ 10,600,000
May 2018 Senior Notes
Debt Disclosure [Line Items]
Senior Notes issued in a private placement to a group of institutional investors				$ 400,000,000
December 2019 Senior Notes
Debt Disclosure [Line Items]
Senior Notes issued in a private placement to a group of institutional investors			$ 350,000,000

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