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Long-Term Debt and Lines of Credit - Schedule of interest costs expensed and capitalized (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Debt Disclosure [Abstract] |  |  |
Interest expense | $ 4,911 | $ 3,324 | $ 3,987
Interest capitalized | 1,439 | 1,493 | 1,431
Total | $ 6,350 | $ 4,817 | $ 5,418

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