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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Assets |  |
Short-term investments | $ 137,753 | $ 149,057
Long-term investments | 56,255 | 48,051
Convertible senior notes hedge | 42,821 | 48,208
Total assets at fair value | 236,829 | 245,316
Current liabilities: |  |
Acquisition-related contingent consideration | 11,210 | 11,050
Non-current liabilities: |  |
Acquisition-related contingent consideration | 5,590 | 5,720
Embedded conversion derivative | 42,821 | 48,208
Total liabilities at fair value | 59,621 | 64,978
U.S. Treasury |  |
Assets |  |
Short-term investments | 7,700 | 4,223
Long-term investments | 7,468 | 6,995
Asset-backed securities |  |
Assets |  |
Short-term investments | 4,512 | 4,811
Corporate debt securities |  |
Assets |  |
Short-term investments | 125,541 | 140,023
Long-term investments | 45,900 | 38,148
Foreign government and agency securities |  |
Assets |  |
Long-term investments | 2,887 | 2,908
Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Short-term investments | 7,700 | 4,223
Long-term investments | 7,468 | 6,995
Convertible senior notes hedge | 0 | 0
Total assets at fair value | 15,168 | 11,218
Current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Non-current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Embedded conversion derivative | 0 | 0
Total liabilities at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Assets |  |
Short-term investments | 7,700 | 4,223
Long-term investments | 7,468 | 6,995
Quoted Prices in Active Markets (Level 1) | Asset-backed securities |  |
Assets |  |
Short-term investments | 0 | 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 |  |
Long-term investments | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Short-term investments | 130,053 | 144,834
Long-term investments | 48,787 | 41,056
Convertible senior notes hedge | 42,821 | 48,208
Total assets at fair value | 221,661 | 234,098
Current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Non-current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Embedded conversion derivative | 42,821 | 48,208
Total liabilities at fair value | 42,821 | 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 | 4,512 | 4,811
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets |  |
Short-term investments | 125,541 | 140,023
Long-term investments | 45,900 | 38,148
Significant Other Observable Inputs (Level 2) | Foreign government and agency securities |  |
Assets |  |
Long-term investments | 2,887 | 2,908
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Convertible senior notes hedge | 0 | 0
Total assets at fair value | 0 | 0
Current liabilities: |  |
Acquisition-related contingent consideration | 11,210 | 11,050
Non-current liabilities: |  |
Acquisition-related contingent consideration | 5,590 | 5,720
Embedded conversion derivative | 0 | 0
Total liabilities at fair value | 16,800 | 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 | 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 |  |
Long-term investments | $ 0 | $ 0

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