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Long-Term Debt and Lines of Credit - Schedule of Interest Costs Expensed and Capitalized (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Debt Disclosure [Abstract] |  |  |  |
Interest expense | $ 8,366 | $ 9,141 | $ 9,893 | $ 8,366
Interest capitalized | 345 | 294 | 172 |
Total | $ 8,711 | $ 9,435 | $ 10,065 |

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