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CONVERTIBLE SENIOR NOTES - Narrative (Details)		8 Months Ended	12 Months Ended
	Feb. 05, 2021 USD ($) patent $ / shares	Sep. 30, 2021 USD ($)	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jan. 13, 2023	Feb. 28, 2021 USD ($)	Feb. 02, 2021 $ / shares
Debt Instrument [Line Items]
Payment costs related to hedge transactions			$ 0	$ 0	$ 33,192,000
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]			Convertible senior notes
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 (as a percent)	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								0.375
Proceeds from debt offerings, net of discounts, commissions and expenses	$ 149,700,000
Debt issuance costs	$ 5,500,000
Remaining unamortized debt discount			$ 19,734,000	$ 27,280,000
Convertible Debt | 2026 Notes | Interest Rate Period One
Debt Instrument [Line Items]
Additional interest (as a percent)						0.25%
Interest rate threshold period						90 days
Convertible Debt | 2026 Notes | Interest Rate Period Two
Debt Instrument [Line Items]
Additional interest (as a percent)						0.50%
Interest rate threshold period						180 days
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	1.30
Trading days in period | patent	20
Consecutive trading days in period | patent	30
Convertible Debt | 2026 Notes | Measurement Period
Debt Instrument [Line Items]
Debt conversion price percentage	0.98
Consecutive trading days in period | patent	5
Convertible Debt | 2026 Notes | Embedded Conversion Derivative
Debt Instrument [Line Items]
Payment costs related to hedge transactions	$ 9,300,000
Embedded derivative, fair value of embedded derivative liability	33,200,000
Value of remaining embedded derivative allocated to host contract	$ 116,500,000
Derivative interest rate	6.71%
Remaining unamortized debt discount			$ 19,700,000
Remaining debt discount amortization period			2 years 3 months 18 days
Convertible Debt | Additional Notes
Debt Instrument [Line Items]
Option period to purchase additional notes	13 days
Additional aggregate principal amount purchased	$ 20,300,000
Convertible Debt | Notes Hedge
Debt Instrument [Line Items]
Debt conversion price (in dollars per share) | $ / shares	$ 20.85
Conversion price premium percentage								0.750
Number of shares that can initially be converted into common stock | patent	7,400,000
Strike price of warrants (in dollar per share) | $ / shares	$ 26.53
Senior notes hedge balance	$ 33,200,000
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
Shares purchased under the notes hedge (in shares) | shares			0
Convertible Debt | Notes Hedge | Observation Period
Debt Instrument [Line Items]
Consecutive trading days in period | patent	80
Incremental dilution of earnings per share of warrants (in shares) | shares			0

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