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Leases - Components of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Lease Assets and Liabilities |  |  |  |  |
Right-of-use assets | $ 44,626 |  | $ 44,626 |  | $ 45,297
Lease liabilities | 5,285 |  | 5,285 |  | 10,563
Lease liabilities, net of current portion | 113,632 |  | 113,632 |  | $ 104,608
Lease Cost |  |  |  |  |
Total | 3,899 | $ 3,003 | 8,148 | $ 5,815 |
Research and development |  |  |  |  |
Lease Cost |  |  |  |  |
Operating lease cost | 2,572 | 2,343 | 5,566 | 4,412 |
Variable lease cost | 836 | 160 | 1,615 | 370 |
General and administrative expense |  |  |  |  |
Lease Cost |  |  |  |  |
Operating lease cost | 491 | 500 | 967 | 1,033 |
Variable lease cost | $ 0 | $ 0 | $ 0 | $ 0 |

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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