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Derivative Instruments and Hedging Activities (Impact of Derivative Instruments on Earnings) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of loss recognized in accumulated OCI | $ (23,105) | $ (18,551) | $ (36,587)
Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of loss reclassified from accumulated OCI into earnings | 45,540 | 41,644 | 67,997
Fair Value Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of loss reclassified from accumulated OCI into earnings | 0 | 0 | 1,814
Loss reclassified from accumulated OCI into earnings | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of loss reclassified from accumulated OCI into earnings | $ 22,435 | $ 23,093 | $ 32,285
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, general and administrative expenses | Selling, general and administrative expenses | Selling, general and administrative expenses
Loss reclassified from accumulated OCI into earnings | Fair Value Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of loss reclassified from accumulated OCI into earnings | $ 0 | $ 0 | $ 939
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, general and administrative expenses | Selling, general and administrative expenses | Selling, general and administrative expenses
Loss recognized in accumulated OCI | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of loss recognized in accumulated OCI | $ 23,105 | $ 18,551 | $ 35,712
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense | Selling, General and Administrative Expense
Loss recognized in accumulated OCI | Fair Value Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of loss recognized in accumulated OCI | $ 0 | $ 0 | $ 875
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense | Selling, General and Administrative Expense

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