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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of (Income) Expense Recognized in Earnings on Derivative | $ 1,330 | $ (32,484) | $ 1,467
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative | 18,262 | (47,759) | 23,000
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | 2,134 | (31,446) | 1,467
Floating-Rate Cross Currency Interest Rate Contract [Member] | Derivatives in Fair Value Hedging Relationships [Member] | Selling, General and Administrative Expense [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of (Income) Expense Recognized in Earnings on Derivative | 4,592 | (9,394) | 472
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative | 4,832 | (8,317) | 1,034
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | 5,396 | (8,356) | 472
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Selling, General and Administrative Expense [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of (Income) Expense Recognized in Earnings on Derivative | (3,190) | (23,018) | 1,067
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative | 13,430 | (39,442) | 21,966
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | (3,190) | (23,018) | 1,067
Treasury Lock [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of (Income) Expense Recognized in Earnings on Derivative | (72) | (72) | (72)
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | $ (72) | $ (72) | $ (72)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + 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 No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558989&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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