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Leases (Tables) | 9 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Sep. 30, 2024
Leases [Abstract] |  |
Components of Lease Costs | The components of our lease costs were as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Operating lease costs |  | $ | 639 |  |  | $ | 810 |  |  | $ | 2,000 |  |  | $ | 3,233 |
Variable and short-term lease costs |  |  | 1,261 |  |  |  | 2,581 |  |  |  | 5,907 |  |  |  | 5,543 |
Interest expense on finance lease liabilities |  |  | — |  |  |  | 746 |  |  |  | 48 |  |  |  | 3,291 |
Amortization expense of finance lease assets |  |  | — |  |  |  | 365 |  |  |  | 54 |  |  |  | 5,001 |
Total lease costs |  | $ | 1,900 |  |  | $ | 4,502 |  |  | $ | 8,009 |  |  | $ | 17,068 |
| The components of our operating and finance lease costs were as follows (in thousands):
|  | Year Ended September 30, |
|  | 2024 |  |  | 2023 |
Operating lease costs |  | $ | 4,309 |  |  | $ | 8,517 |
Variable and short-term lease costs |  |  | 9,545 |  |  |  | 3,691 |
Interest expense on finance lease liabilities |  |  | 3,530 |  |  |  | 4,492 |
Amortization expense of finance lease assets |  |  | 5,163 |  |  |  | 13,414 |
Total lease costs |  | $ | 22,547 |  |  | $ | 30,114 |
Schedule of Weighted Average Remaining Terms and Discount Rates for Operating and Financing Leases |  | The table below presents the weighted average remaining terms and discount rates for our operating and finance leases as of September 30, 2024:
As of September 30, 2024 |  |  |
Finance leases: |  |  |  |
Weighted average remaining lease term |  |  | 2.7 |
Weighted average discount rate |  |  | 5.8 | %
Operating leases: |  |  |  |
Weighted average remaining lease term |  |  | 6.5 |
Weighted average discount rate |  |  | 6.0 | %
Schedule of Future Minimum Rental Payments Under Operating and Finance Leases of Initial or Remaining Non-cancelable Lease Terms |  | The following table summarizes future minimum rental payments, primarily related to facilities and leased aircraft, required under operating and finance leases that had initial or remaining non-cancelable lease terms as of September 30, 2024 (in thousands):
Periods Ending September 30, |  | Operating Leases |  |  | Finance Leases |
2025 |  | $ | 2,273 |  |  | $ | 1,762 |
2026 |  |  | 1,613 |  |  |  | 1,714 |
2027 |  |  | 1,468 |  |  |  | 1,206 |
2028 |  |  | 1,037 |  |  |  | — |
2029 |  |  | 941 |  |  |  | — |
Thereafter |  |  | 3,187 |  |  |  | — |
Total lease payments |  |  | 10,519 |  |  |  | 4,682 |
Less: imputed interest |  |  | (1,929 | ) |  |  | — |
Amounts recorded in the consolidated balance sheet |  | $ | 8,590 |  |  | $ | 4,682 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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