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Credit Facilities and Short-term Borrowings (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017
Foreign Lines of Credit And Overdraft Facilities [Member] |  |
Debt And Line Of Credit Facility [Line Items] |  |
Outstanding borrowings | $ 0 |
Revolving Credit Agreement [Member] |  |
Debt And Line Of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 1,000,000,000 |
Option to increase maximum borrowings to this amount | $ 1,200,000,000 |
Line of Credit Facility, Expiration Date | Apr. 01, 2020 |
Variable Rate Basis | LIBOR |
Credit facility effective interest rate on outstanding borrowing | 2.52% | 2.29%
Outstanding borrowings | $ 66,300,000 | $ 32,600,000
Minimum [Member] | Revolving Credit Agreement [Member] |  |
Debt And Line Of Credit Facility [Line Items] |  |
Basis Spread On Variable Rate | 0.85% |
Maximum [Member] | Revolving Credit Agreement [Member] |  |
Debt And Line Of Credit Facility [Line Items] |  |
Basis Spread On Variable Rate | 1.65% |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility that the borrower has the option to increase to subject to lenders' participation. + References No definition available. + Details
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