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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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