Derivative Instruments and Hedging Activities (Impact of Derivative Instruments on Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments Gain Loss [Line Items]
Amount of (Income) Expense Recognized in Earnings on Derivative	$ (1,429)	$ (26,968)	$ 44,377	$ (43,299)
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	9,389	(34,207)	44,073	(58,987)
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	1,429	(26,968)	44,377	(43,299)
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	$ 2	$ (1,087)	$ 939	$ (2,006)
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	$ (42)	$ (903)	$ 875	$ (1,960)
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	$ 2	$ (1,087)	$ 939	$ (2,006)
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	$ (1,431)	$ (25,881)	$ 43,438	$ (41,293)
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	$ 9,431	$ (33,304)	$ 43,198	$ (57,027)
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	$ (1,431)	$ (25,881)	$ 43,438	$ (41,293)