Derivative Instruments and Hedging Activities (Impact of Derivative Instruments on Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments Gain Loss [Line Items]
Amount of Loss (gain) recognized in accumulated OCI	$ 11,402	$ (7,349)	$ (8,966)	$ 11,161
Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Amount of Expense (income) recognized and loss (gain) reclassified from accumulated OCI into earnings	16,560	(8,875)	(11,123)	9,024
Amount of Loss (gain) recognized in accumulated OCI	$ 11,402	$ (7,349)	$ (8,966)	$ 11,161
Expense (income) recognized and loss (gain) reclassified from accumulated OCI into earnings | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
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
Loss (gain) recognized in accumulated OCI | Derivatives in Fair Value Hedging Relationships [Member]
Derivative Instruments Gain Loss [Line Items]
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