Derivative Instruments and Hedging Activities (Impact of Derivative Instruments on Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Derivative Instruments Gain Loss [Line Items]
Amount of (Income) Expense Recognized in Earnings on Derivative	$ 7,620	$ (6,256)	$ 45,806	$ (16,331)
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	2,096	(12,411)	34,684	(24,780)
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	7,620	(6,256)	45,806	(16,331)
Floating-Rate Cross Currency Interest Rate Contract [Member] | Derivatives in Fair Value Hedging Relationships [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of (Income) Expense Recognized in Earnings on Derivative	$ 36	$ (297)	$ 937	$ (919)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	$ 21	$ (557)	$ 917	$ (1,057)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	$ 36	$ (297)	$ 937	$ (919)
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Amount of (Income) Expense Recognized in Earnings on Derivative	$ 7,584	$ (5,959)	$ 44,869	$ (15,412)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	$ 2,075	$ (11,854)	$ 33,767	$ (23,723)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense	Selling General And Administrative Expense
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	$ 7,584	$ (5,959)	$ 44,869	$ (15,412)