Fair Value Measurements - Foreign Exchange Contracts (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Assets:
Foreign exchange contracts	$ 370	$ 17
Liabilities:
Foreign exchange contracts	238	340
Significant Other Observable Inputs (Level 2)
Assets:
Foreign exchange contracts	370	17
Liabilities:
Foreign exchange contracts	$ 238	340
Significant Other Observable Inputs (Level 2) | Maximum
Assets:
Foreign exchange contracts		$ 200