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Shareholders' Equity - AOCI Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Operations |  |  |  |
Total reclassifications for the period | $ (308) | $ (366) | $ (648) | $ (732)
Defined benefit pension plan |  |  |  |
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Operations |  |  |  |
Reclassifications for the period, tax | 152 | 209 | 273 | 418
Amortization of net actuarial loss on defined benefit pension plan | General and Administrative |  |  |  |
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Operations |  |  |  |
Reclassifications for the period, before tax | $ (460) | $ (575) | $ (921) | $ (1,150)

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