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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - Convertible Debt	Jun. 30, 2021	Aug. 31, 2020	Sep. 30, 2019
2020 Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		0.125%
2019 Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			0.125%
2021 Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.25%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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