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CONVERTIBLE SENIOR NOTES - Carrying Value of 2026 Notes (Details) - Convertible Debt - 2026 Notes - USD ($)	Sep. 30, 2023	Sep. 30, 2022	Feb. 28, 2021	Feb. 05, 2021
Debt Instrument [Line Items]
Debt interest rate (as a percent)	0.75%			0.75%
Debt issued	$ 155,300,000		$ 155,300,000
Principal amount	155,250,000	$ 155,250,000
Less: unamortized discount and issuance costs, net of amortization	(19,734,000)	(27,280,000)
Carrying amount	$ 135,516,000	$ 127,970,000

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