Derivative Financial Instruments (Derivatives Not Designated as Cash Flow Hedges) (Details) - Fair Value, Inputs, Level 2 - Fair Value, Measurements, Recurring - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	$ 0	$ 9
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	$ 55	$ 0