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Convertible Senior Notes - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Total interest expense recognized	$ 1,587	$ 2,223	$ 1,319	$ 0	$ 5,129	$ 0	$ 0
Convertible Debt | Convertible Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Contractual interest expense					756	0
Amortization of debt discount and issuance costs					4,372	0
Total interest expense recognized					$ 5,128	$ 0

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