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Shareholders' Equity - AOCI Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Loss |  |
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Operations |  |
Total reclassifications for the period | $ 340 | $ 366
Defined benefit pension plan |  |
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Operations |  |
Reclassifications for the period, tax | (121) | (209)
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 | $ 461 | $ 575

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