Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Equity [Abstract]
Cumulative effect of foreign currency translation	$ (4,564)	$ (4,346)
Cumulative unrealized loss on pension liability	(6,479)	(6,479)
Accumulated other comprehensive loss	$ (11,043)	$ (10,825)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant