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Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Nov. 25, 2020 | Sep. 30, 2020
Notes Payable to Banks [Member] | Series J Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Borrowings principal payment |  | $ 100,000 |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000 |  |
Line of credit facility, maximum borrowing capacity extension | 1,500,000 |  |
Outstanding borrowings | 0 |  | $ 0
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Short-term borrowings | $ 0 |  | $ 0
Minimum [Member] | LIBOR [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.875% |  |
Maximum [Member] | LIBOR [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.75% |  |

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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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