Derivative Financial Instruments (Derivatives Not Designated for Hedging) (Details) - Fair Value, Inputs, Level 2 - Fair Value, Recurring - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 18	$ 7
Other Current Liabilities | Total return swaps—deferred compensation
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 130	$ 0