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Leases (Tables) | 12 Months Ended
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Sep. 30, 2025
Leases [Abstract] |
Summary of ROU assets and lease liabilities |
| September 30,
| 2025 |  | 2024
ROU assets: |  |  |
Other assets | $ | 26.2 |  |  | $ | 5.8 |
Lease liabilities: |  |  |
Other current liabilities | $ | 2.6 |  |  | $ | 2.2 |
Other liabilities | 26.9 |  |  | 4.3 |
Total liabilities | $ | 29.5 |  |  | $ | 6.5 |
Lessee, operating lease, liability, maturity |
Fiscal 2026 | $ | 3.2 |  |  |  |  |
Fiscal 2027 | 4.1 |  |  |  |  |
Fiscal 2028 | 5.3 |  |  |  |  |
Fiscal 2029 | 5.4 |  |  |  |  |
Fiscal 2030 | 5.5 |  |  |  |  |
Thereafter | 34.8 |  |  |  |  |
Total future minimum payments | 58.3 |  |  |  |  |
Less: Implied interest | 19.2 |  |  |  |  |
Less: Tenant improvement allowance | 9.6 |  |  |  |  |
Total lease liabilities | $ | 29.5 |  |  |  |  |
Lease, costs and supplemental disclosures |
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
Total operating lease expense | $3.9 |  | $3.4 |  | $3.1
Variable lease expense | 1.3 |  | 1.0 |  | 0.9
Weighted-average remaining lease term | 10 years |  | 4 years |  | 4 years
Weighted-average incremental borrowing rate | 7.0% |  | 4.9% |  | 4.8%

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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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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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