Derivative Instruments - Notional Amounts Outstanding under Foreign Currency Contracts - Fair Value of Assets (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Fair Value of Assets	$ 170	$ 4
Foreign Exchange Contract
Derivative [Line Items]
Fair Value of Assets	$ 170	$ 4

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

No definition available.

Name:	us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant