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Derivative Instruments and Hedging Activities (Impact of Derivative Instruments on Earnings) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of (Income) Expense Recognized in Earnings on Derivative | $ 23,093 | $ 33,224 | $ (68,880)
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative | 18,551 | 36,587 | (89,048)
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | 23,093 | 33,224 | (68,880)
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 | $ 0 | $ 939 | $ (2,844)
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
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative | $ 0 | $ 875 | $ (2,854)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, general and administrative expenses | Selling, general and administrative expenses | Selling, general and administrative expenses
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | $ 0 | $ 939 | $ (2,844)
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 | $ 23,093 | $ 32,285 | $ (66,036)
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
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative | $ 18,551 | $ 35,712 | $ (86,194)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, general and administrative expenses | Selling, general and administrative expenses | Selling, general and administrative expenses
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | $ 23,093 | $ 32,285 | $ (66,036)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from effective portion of derivative instrument reclassified from accumulated other comprehensive income (AOCI) into income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4D + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition Amount, before tax and adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480627/815-20-45-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (dd) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (bb) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CCC -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CCC + Details
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