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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Assets |  |
Short-term investments | $ 138,302 | $ 40,035
Long-term investments | 36,643 | 1,963
Convertible senior notes hedge | 54,334 |
Total assets at fair value | 229,279 | 41,998
Current liabilities: |  |
Acquisition-related contingent consideration | 9,950 | 753
Liabilities, Noncurrent [Abstract] |  |
Acquisition-related consideration, noncurrent | 5,330 |
Embedded conversion derivative | 54,334 |
Total liabilities at fair value | 69,614 | 753
U.S. Treasury |  |
Assets |  |
Short-term investments | 5,241 | 10,283
Long-term investments | 4,997 | 0
Asset-backed securities |  |
Assets |  |
Short-term investments | 6,052 | 4,759
Long-term investments | 0 |
Corporate debt securities |  |
Assets |  |
Short-term investments | 61,394 | 9,619
Long-term investments | 28,727 | 1,963
Commercial paper |  |
Assets |  |
Short-term investments | 65,615 | 15,374
Foreign government and agency securities |  |
Assets |  |
Long-term investments | 2,919 |
Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Short-term investments | 5,241 | 10,283
Long-term investments | 4,997 | 0
Convertible senior notes hedge | 0 |
Total assets at fair value | 10,238 | 10,283
Current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Liabilities, Noncurrent [Abstract] |  |
Acquisition-related consideration, noncurrent | 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 | 5,241 | 10,283
Long-term investments | 4,997 | 0
Quoted Prices in Active Markets (Level 1) | Asset-backed securities |  |
Assets |  |
Short-term investments | 0 | 0
Long-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) | Commercial paper |  |
Assets |  |
Short-term investments | 0 | 0
Quoted Prices in Active Markets (Level 1) | Foreign government and agency securities |  |
Assets |  |
Long-term investments | 0 |
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Short-term investments | 133,061 | 29,752
Long-term investments | 31,646 | 1,963
Convertible senior notes hedge | 54,334 |
Total assets at fair value | 219,041 | 31,715
Current liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Liabilities, Noncurrent [Abstract] |  |
Acquisition-related consideration, noncurrent | 0 |
Embedded conversion derivative | 54,334 |
Total liabilities at fair value | 54,334 | 0
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 | 6,052 | 4,759
Long-term investments | 0 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets |  |
Short-term investments | 61,394 | 9,619
Long-term investments | 28,727 | 1,963
Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Assets |  |
Short-term investments | 65,615 | 15,374
Significant Other Observable Inputs (Level 2) | Foreign government and agency securities |  |
Assets |  |
Long-term investments | 2,919 |
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 | 9,950 | 753
Liabilities, Noncurrent [Abstract] |  |
Acquisition-related consideration, noncurrent | 5,330 |
Embedded conversion derivative | 0 |
Total liabilities at fair value | 15,280 | 753
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
Long-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) | Commercial paper |  |
Assets |  |
Short-term investments | 0 | $ 0
Significant Unobservable Inputs (Level 3) | Foreign government and agency securities |  |
Assets |  |
Long-term investments | $ 0 |

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