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Debt Instrument, Convertible, Conversion Price Premium Percentage

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Debt Instrument, Discount (Premium) And Debt Issuance Costs, Amortization Period

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Debt Instrument, Period To Exercise Option To Repurchase Additional Notes

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Debt Instrument, Repurchased, Additional Face Amount

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Host Financial Instrument, Fair Value

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Proceeds From Convertible Debt, Net Of Debt Issuance Costs

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Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fixed interest rate related to the interest rate derivative.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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The cash outflow for derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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Price of a single share of a number of saleable stocks of a company.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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Convertible Senior Notes - Narrative (Details)		3 Months Ended	9 Months Ended		17 Months Ended
Convertible Senior Notes - Narrative (Details)	Feb. 05, 2021 USD ($) tradingDay shares $ / shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) shares	Jun. 30, 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
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		29,093,000	29,093,000		29,093,000	29,093,000	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		$ 29,100,000	$ 29,100,000		$ 29,100,000	$ 29,100,000
Remaining debt discount amortization period (in years)	3 years 7 months 6 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