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Credit Facilities, Short-term Borrowings (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Maximum borrowing capacity | $ 1,048,808 |  |
Debt Covenant, Leverage Ratio, Maximum | 3.5 to 1.0 |  |
Accelerated amortization of debt financing costs recognized as interest expense | $ 1,114 | $ 1,014 | $ 1,045
Outstanding borrowings | 352,430 |  |
Short-term borrowings | 2,430 | 0 |
Line of Credit Facility, Remaining Borrowing Capacity | 687,758 |  |
Additional borrowing availability | 687,758 |  |
Long-term debt, excluding current portion | 850,000 | 710,000 |
Amortization of Financing Costs | 1,114 | $ 1,014 | $ 1,045
Other Foreign Short-term Borrowings [Member] |  |  |
Outstanding borrowings | 0 |  |
Foreign Performance Guarantee Facilities [Member] |  |  |
Maximum borrowing capacity | 8,619 |  |
Outstanding borrowings | 0 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 8,276 |  |
Additional borrowing availability | 8,276 |  |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |
Maximum borrowing capacity | 40,189 |  |
Outstanding borrowings | 2,430 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 37,759 |  |
Additional borrowing availability | 37,759 |  |
Revolving Credit Facility [Member] |  |  |
Maximum borrowing capacity | 1,000,000 |  |
Outstanding borrowings | 350,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 641,723 |  |
Additional borrowing availability | $ 641,723 |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |
Basis Spread On Variable Rate | 0.85% |  |
The Notes [Member] |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value | $ 800,000 |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income | 50.00% |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum | 4.0 to 1.0 |  |
Amended Revolving Credit Agreement [Member] |  |  |
Variable Rate Basis | LIBOR |  |

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + 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=49121117&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=49121117&loc=d3e13476-108611 + Details
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