CONVERTIBLE SENIOR NOTES- Narrative (Details) - Convertible Debt		3 Months Ended	9 Months Ended	17 Months Ended	25 Months Ended
	Feb. 05, 2021 USD ($) tradingDay shares $ / shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 shares	Jun. 30, 2023 USD ($) shares	Jan. 13, 2023	Sep. 30, 2022 USD ($)	Feb. 28, 2021 USD ($)	Feb. 02, 2021 $ / shares
2026 Notes
Debt Instrument [Line Items]
Debt issued		$ 155,300,000	$ 155,300,000		$ 155,300,000			$ 155,300,000
Debt interest rate (as a percent)	0.75%	75.00%	75.00%		75.00%
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		$ 21,671,000	$ 21,671,000		$ 21,671,000		$ 27,280,000
2026 Notes | Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares									$ 15.16
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
2026 Notes | Measurement period
Debt Instrument [Line Items]
Debt conversion price percentage	98.00%
Consecutive trading days in period (in days) | tradingDay	5
2026 Notes | Embedded Derivative Financial Instruments
Debt Instrument [Line Items]
Payment costs related to hedge transactions	$ 9,300,000
Embedded conversion derivative	33,200,000
Value of remaining embedded derivative allocated to host contract	$ 116,500,000
Derivative interest rate		6.71%	6.71%		6.71%
Remaining unamortized debt discount		$ 21,700,000	$ 21,700,000		$ 21,700,000
Remaining debt discount amortization period (in years)			2 years 7 months 6 days
2026 Notes | Interest Rate Period One
Debt Instrument [Line Items]
Additional interest percentage						0.25%
Interest rate threshold period						90 days
2026 Notes | Interest Rate Period Two
Debt Instrument [Line Items]
Additional interest percentage						0.50%
Interest rate threshold period						180 days
Additional Notes
Debt Instrument [Line Items]
Option period to purchase additional notes (in days)	13 days
Additional aggregate principal amount purchased	$ 20,250,000
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
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