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Convertible Senior Notes - Narrative (Details) |  | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 05, 2021 USD ($) patent $ / shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) | Feb. 02, 2021 $ / shares | Sep. 30, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payment costs related to hedge transactions |  |  |  | $ 33,192,000 | $ 0 |  |
Embedded conversion derivative |  | $ 34,719,000 | $ 34,719,000 | 34,719,000 |  |  |
Senior notes hedge balance |  | 34,719,000 | 34,719,000 | 34,719,000 |  |  | $ 0
Increase in additional paid-in-capital for sale or warrants |  |  | 23,909,000 | 23,909,000 |  |  |
Convertible Debt | 2026 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issued | $ 155,300,000 |  |  |  |  |  |
Debt interest rate | 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 |  | 37,558,000 | 37,558,000 | 37,558,000 |  |  |
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 | During any calendar quarter commencing after the calendar quarter ending on June 30, 2021 | Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Sale price per share of common stock at par value | $ / shares | $ 0.001 |  |  |  |  |  |
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 | Observation period |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Consecutive trading days in period | patent | 40 |  |  |  |  |  |
Convertible Debt | 2026 Notes | Embedded conversion derivative |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payment costs related to hedge transactions | $ 9,300,000 |  |  |  |  |  |
Embedded conversion derivative | 33,200,000 | 34,719,000 | 34,719,000 | 34,719,000 |  |  |
Value of remaining embedded derivative allocated to host contract | $ 116,500,000 |  |  |  |  |  |
Derivative interest rate | 6.71% |  |  |  |  |  |
Remaining unamortized debt discount |  | $ (37,600,000) | $ (37,600,000) | $ (37,600,000) |  |  |
Remaining debt discount amortization period | 4 years 9 months 18 days |  |  |  |  |  |
Convertible Debt | Additional Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Option period to purchase additional notes | 13 days |  |  |  |  |  |
Additional aggregate principal amount purchased | $ 20,250,000 |  |  |  |  |  |
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 |  |  |  |  |  |
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 |  |  |
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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