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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Assets: |  |
Short-term investments: | $ 37,910 | $ 149,057
Long-term investments: | 31,493 | 48,051
Convertible senior notes hedge |  | 48,208
Total assets at fair value | 69,403 | 245,316
Current liabilities: |  |
Acquisition-related contingent consideration | 10,790 | 11,050
Non-current liabilities: |  |
Acquisition-related contingent consideration | 5,200 | 5,720
Embedded conversion derivative |  | 48,208
Total liabilities at fair value | 15,990 | 64,978
U.S. Treasury |  |
Assets: |  |
Short-term investments: | 1,980 | 4,223
Long-term investments: | 7,266 | 6,995
Asset-backed securities |  |
Assets: |  |
Short-term investments: |  | 4,811
Corporate debt securities |  |
Assets: |  |
Short-term investments: | 33,080 | 140,023
Long-term investments: | 24,227 | 38,148
Foreign government and agency securities |  |
Assets: |  |
Short-term investments: | 2,850 |
Long-term investments: |  | 2,908
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Short-term investments: | 1,980 | 4,223
Long-term investments: | 7,266 | 6,995
Convertible senior notes hedge |  | 0
Total assets at fair value | 9,246 | 11,218
Current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Non-current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Embedded conversion derivative |  | 0
Total liabilities at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 1,980 | 4,223
Long-term investments: | 7,266 | 6,995
Quoted Prices in Active Markets (Level 1) | Asset-backed securities |  |
Assets: |  |
Short-term investments: |  | 0
Quoted Prices in Active Markets (Level 1) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Quoted Prices in Active Markets (Level 1) | Foreign government and agency securities |  |
Assets: |  |
Short-term investments: | 0 |
Long-term investments: |  | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Short-term investments: | 35,930 | 144,834
Long-term investments: | 24,227 | 41,056
Convertible senior notes hedge |  | 48,208
Total assets at fair value | 60,157 | 234,098
Current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Non-current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Embedded conversion derivative |  | 48,208
Total liabilities at fair value | 0 | 48,208
Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets: |  |
Short-term investments: |  | 4,811
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 33,080 | 140,023
Long-term investments: | 24,227 | 38,148
Significant Other Observable Inputs (Level 2) | Foreign government and agency securities |  |
Assets: |  |
Short-term investments: | 2,850 |
Long-term investments: |  | 2,908
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Convertible senior notes hedge |  | 0
Total assets at fair value | 0 | 0
Current liabilities: |  |
Acquisition-related contingent consideration | 10,790 | 11,050
Non-current liabilities: |  |
Acquisition-related contingent consideration | 5,200 | 5,720
Embedded conversion derivative |  | 0
Total liabilities at fair value | 15,990 | 16,770
Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets: |  |
Short-term investments: |  | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Significant Unobservable Inputs (Level 3) | Foreign government and agency securities |  |
Assets: |  |
Short-term investments: | $ 0 |
Long-term investments: |  | $ 0

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