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DEBT - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2024 USD ($) | Feb. 05, 2021 USD ($) tradingDay shares $ / shares | Mar. 31, 2024 USD ($) shares | Mar. 31, 2024 USD ($) shares | Sep. 30, 2023 USD ($) | Jan. 13, 2023 | Feb. 28, 2021 USD ($) | Feb. 02, 2021 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  |  | Convertible senior notes | Convertible senior notes |  |  |  |
Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unused revolving line facility fee (as a percent) | 0.25% |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs | $ 300,000 |  |  |  |  |  |  |
Maximum borrowing capacity | 35,000,000 |  |  |  |  |  |  |
Additional value, line of credit facility, maximum borrowing capacity | 15,000,000 |  |  |  |  |  |  |
Indebtedness amount | 500,000 |  |  |  |  |  |  |
Carrying amount |  |  | $ 0 | $ 0 |  |  |  |
Line of Credit | Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fees | $ 87,500 |  |  |  |  |  |  |
Foreign Letter Of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash deposit, percentage | 115.00% |  |  |  |  |  |  |
2026 Notes | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair value |  |  | 154,700,000 | 154,700,000 |  |  |  |
2026 Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  | $ 155,300,000 | $ 155,300,000 |  |  | $ 155,300,000 |
Debt interest rate (as a percent) |  | 0.75% | 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 |  |  | $ 15,758,000 | $ 15,758,000 | $ 19,734,000 |  |  |
Carrying amount |  |  | $ 139,492,000 | $ 139,492,000 | $ 135,516,000 |  |  |
2026 Notes | Convertible Debt | Common Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 15.16
2026 Notes | Convertible Debt | 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 | Convertible Debt | Measurement period |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt conversion price percentage |  | 98.00% |  |  |  |  |  |
Consecutive trading days in period (in days) | tradingDay |  | 5 |  |  |  |  |  |
2026 Notes | Convertible Debt | Embedded Derivative Financial Instruments |  |  |  |  |  |  |  |
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% | 6.71% |  |  |  |
Remaining unamortized debt discount |  |  | $ 15,800,000 | $ 15,800,000 |  |  |  |
Remaining debt discount amortization period (in years) |  |  |  | 1 year 10 months 2 days |  |  |  |
2026 Notes | Convertible Debt | Interest Rate Period One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Additional interest percentage |  |  |  |  |  | 0.25% |  |
Interest rate threshold period |  |  |  |  |  | 90 days |  |
2026 Notes | Convertible Debt | Interest Rate Period Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Additional interest percentage |  |  |  |  |  | 0.50% |  |
Interest rate threshold period |  |  |  |  |  | 180 days |  |
Additional Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Option period to purchase additional notes (in days) |  | 13 days |  |  |  |  |  |
Additional aggregate principal amount purchased |  | $ 20,250,000 |  |  |  |  |  |
Notes Hedge | Convertible Debt |  |  |  |  |  |  |  |
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 |  |  |  |
Notes Hedge | Convertible Debt | 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 |  |  |  |  |

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