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Shareholders' Equity - AOCI Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 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	$ (337)	$ (365)	$ (985)	$ (1,097)
Defined benefit pension plan
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Operations
Reclassifications for the period, tax	124	209	397	627
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)	$ (574)	$ (1,382)	$ (1,724)

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Amount before tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
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-Topic 220
-SubTopic 10
-Section 45
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 45
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