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Derivative Financial Instruments (Derivatives Not Designated as Cash Flow Hedges) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain	$ (352)	$ 0	$ (41)	$ 0
General and Administrative Expense
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain	(352)	$ 0	(41)	$ 0
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring \| Total Return Swap \| Not Designated as Hedging Instrument \| Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	250		250		$ 0
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring \| Total Return Swap \| Not Designated as Hedging Instrument \| Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0		0		130
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring \| Foreign currency forward contracts \| Not Designated as Hedging Instrument \| Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0		$ 0		$ 18