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Convertible Senior Notes - Narrative (Details)		3 Months Ended		6 Months Ended		14 Months Ended
	Feb. 05, 2021 USD ($) tradingDay shares $ / shares	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) shares	Mar. 31, 2022 USD ($) shares	Sep. 30, 2021 USD ($)	Feb. 28, 2021 USD ($)	Feb. 02, 2021 $ / shares
Debt Instrument [Line Items]
Payment costs related to hedge transactions				$ 0	$ 33,192,000
Embedded conversion derivative								$ 48,208,000
Senior notes hedge balance		$ 0		0		$ 0	$ 0	48,208,000
Increase in additional paid-in-capital for sale or warrants			$ 23,909,000		$ 23,909,000
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Debt issued	$ 155,300,000								$ 155,300,000
Debt interest rate	0.75%								0.75%
Debt conversion ratio (per $1,000 principal amount)	0.0479731000
Debt conversion price (in dollars per share) | $ / shares	$ 20.85
Conversion price premium percentage										37.50%
Proceeds from debt offerings, net of discounts, commissions and expenses	$ 149,700,000
Debt issuance costs	$ 5,500,000
Remaining unamortized debt discount		30,880,000		30,880,000		30,880,000	30,880,000	34,332,000
Convertible Debt | 2026 Notes | Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares										$ 15.16
Convertible Debt | 2026 Notes | During any calendar quarter commencing after the calendar quarter ending on June 30, 2021
Debt Instrument [Line Items]
Debt conversion price percentage	130.00%
Trading days in period (in days) | tradingDay	20
Consecutive trading days in period (in days) | tradingDay	30
Convertible Debt | 2026 Notes | Measurement period
Debt Instrument [Line Items]
Debt conversion price percentage	98.00%
Consecutive trading days in period (in days) | tradingDay	5
Convertible Debt | 2026 Notes | Embedded conversion derivative
Debt Instrument [Line Items]
Payment costs related to hedge transactions	$ 9,300,000
Embedded conversion derivative	33,200,000	0		0		0	0	$ 48,208,000
Value of remaining embedded derivative allocated to host contract	$ 116,500,000
Derivative interest rate	6.71%
Remaining unamortized debt discount		$ 30,900,000		$ 30,900,000		$ 30,900,000	$ 30,900,000
Remaining debt discount amortization period (in years)	3 years 9 months 18 days
Convertible Debt | Additional Notes
Debt Instrument [Line Items]
Option period to purchase additional notes (in days)	13 days
Additional aggregate principal amount purchased	$ 20,250,000
Convertible Debt | Notes Hedge
Debt Instrument [Line Items]
Debt conversion price (in dollars per share) | $ / shares	$ 20.85
Conversion price premium percentage										75.00%
Number of shares that can initially be converted into common stock (in shares) | shares	7,400,000
Strike price of warrants (in dollar per share) | $ / shares	$ 26.53
Senior notes hedge balance	$ 33,200,000
Shares purchased under the notes hedge (in shares) | shares						0
Increase in additional paid-in-capital for sale or warrants	$ 23,900,000
Warrants exercised (in shares) | shares							0
Warrants outstanding (in shares) | shares		0		0		0	0
Convertible Debt | Notes Hedge | Observation period
Debt Instrument [Line Items]
Consecutive trading days in period (in days) | tradingDay	80
Incremental dilution of earnings per share of warrants (in shares) | shares		0

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