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, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Foreign currency balance sheet hedging
Foreign currency net gain (loss)	$ 223	$ 105	$ (369)	$ (52)
Foreign Currency Transaction
Foreign currency balance sheet hedging
Foreign currency net gain (loss)	724	(93)	(347)	247
Foreign Exchange Forward
Foreign currency balance sheet hedging
Foreign currency net gain (loss)	$ (501)	$ 198	$ (22)	$ (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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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