Fair Value Measurements - Foreign Exchange Contracts (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Assets:
Foreign exchange contracts	$ 170	$ 4
Liabilities:
Foreign exchange contracts	177	146
Significant Other Observable Inputs (Level 2)
Assets:
Foreign exchange contracts	170	4
Liabilities:
Foreign exchange contracts	$ 177	$ 146

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

No definition available.

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