Foreign Currency Forward Contracts (Details) - Selling, General and Administrative Expenses - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2019	Mar. 31, 2019
Foreign currency balance sheet hedging
Foreign currency net gain (loss)	$ 105	$ (52)
Foreign Currency Transaction
Foreign currency balance sheet hedging
Foreign currency net gain (loss)	(93)	247
Foreign Exchange Forward
Foreign currency balance sheet hedging
Foreign currency net gain (loss)	$ 198	$ (299)

Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894

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