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Credit Facilities and Short-term Borrowings (Short-term Borrowings and Availability Under Various Short-term Credit Facilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Total availability | $ 1,017,588 |
Outstanding letters of credit and guarantees | (10,972) |
Outstanding borrowings | (32,600) |
Remaining availability | 974,016 |
Foreign Performance Guarantee Facilities [Member] |  |
Line of Credit Facility [Line Items] |  |
Total availability | 10,058 |
Outstanding letters of credit and guarantees | (351) |
Outstanding borrowings | 0 |
Remaining availability | 9,707 |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |
Line of Credit Facility [Line Items] |  |
Total availability | 7,530 |
Outstanding letters of credit and guarantees | 0 |
Outstanding borrowings | 0 |
Remaining availability | 7,530 |
Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Total availability | 1,000,000 |
Outstanding letters of credit and guarantees | (10,621) |
Outstanding borrowings | (32,600) | $ (156,700)
Remaining availability | $ 956,779 |

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 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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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit and guarantees outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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