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Leases (Tables) | 12 Months Ended
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Sep. 30, 2025
Leases |
Schedule of components of lease costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |  | Year Ended
​ | ​ | September 30, | ​ | September 30,
(Dollars in thousands) |  | 2025 |  | 2024
Finance lease cost: |  | ​ |  | ​ | ​ | ​
Amortization | ​ | $ | 1,489 | ​ | ​ | 1,510
Interest on lease liabilities | ​ |  | 802 | ​ | ​ | 861
Operating lease cost | ​ |  | 7,810 | ​ | ​ | 6,582
Total lease cost | ​ | $ | 10,101 | ​ | ​ | 8,953
Schedule of additional information related to leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended |  | Year Ended |
​ | ​ | September 30, | ​ | September 30, | ​
(Dollars in thousands) | ​ | 2025 | ​ | 2024 | ​
Cash paid for amounts included in the measurement of lease liabilities: | ​ | ​ | ​ |  | ​ |  |
Operating cash flows from operating leases | ​ | $ | 7,318 | ​ | ​ | 6,349 |
Operating cash flows from finance leases | ​ | ​ | 802 | ​ | ​ | 861 |
Financing cash flows from finance leases | ​ | ​ | 1,430 | ​ | ​ | 1,351 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Right-of-use assets obtained in exchange for operating lease liabilities | ​ | $ | 16,426 | ​ | ​ | 3,028 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term: | ​ | ​ | ​ | ​ |  | ​ |
Operating leases | ​ | ​ | 9.3 | yrs |  | 10.5 | yrs
Finance leases | ​ | ​ | 9.7 | yrs |  | 10.4 | yrs
Weighted-average discount rate: | ​ | ​ | ​ | ​ |  | ​ |
Operating leases | ​ | ​ | 4.8 | % |  | 4.6 | %
Finance leases | ​ | ​ | 4.7 | % |  | 4.7 | %
Schedule of reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets | The table below is a reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets, presented on our Consolidated Balance Sheet on September 30, 2025: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | Operating | ​ | Finance
Years Ending September 30: |  | Leases |  | Leases
2026 | ​ | $ | 7,951 | ​ | ​ | 2,297
2027 | ​ |  | 7,709 | ​ | ​ | 2,357
2028 | ​ |  | 7,574 | ​ | ​ | 2,417
2029 | ​ | ​ | 6,134 | ​ | ​ | 2,478
2030 and thereafter | ​ |  | 33,540 | ​ | ​ | 11,575
Total minimum lease payments | ​ | ​ | 62,908 | ​ | ​ | 21,124
Less: amounts representing interest | ​ |  | 12,611 | ​ | ​ | 4,571
Present value of net minimum lease payments | ​ | $ | 50,297 | ​ | ​ | 16,553
Less: current portion of lease obligations | ​ |  | 5,894 | ​ | ​ | 1,554
Non-current portion of lease obligations | ​ | ​ | 44,403 | ​ | ​ | 14,999
​ | ​ | ​ | ​ | ​ | ​ | ​
ROU assets | ​ | $ | 47,707 | ​ | ​ | 12,194
​ The table below is a reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets, presented on our Consolidated Balance Sheet on September 30, 2024: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | Operating |  | Finance
Years Ending September 30: | ​ | Leases | ​ | Leases
2025 | ​ | $ | 6,394 |  | 2,233
2026 | ​ |  | 5,118 |  | 2,297
2027 | ​ |  | 4,813 |  | 2,357
2028 | ​ |  | 4,517 |  | 2,417
2029 and thereafter | ​ |  | 29,765 |  | 14,053
Total minimum lease payments | ​ | ​ | 50,607 |  | 23,357
Less: amounts representing interest | ​ |  | 11,026 |  | 5,373
Present value of net minimum lease payments | ​ | $ | 39,581 |  | 17,984
Less: current portion of lease obligations | ​ |  | 4,771 |  | 1,431
Non-current portion of lease obligations | ​ |  | 34,810 |  | 16,553
​ | ​ | ​ | ​ | ​ | ​
ROU assets | ​ | $ | 37,476 | ​ | 13,683

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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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