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Debt (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 14, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility |  |  | $ 330,000,000 |  |
Revolving credit facility period | 5 years |  |  |  |
Available to borrow under the credit facility |  | 265,000,000 |  |  |
Option amount to increase credit facility |  | 250,000,000 |  |  |
Cash on hand |  | 42,850,000 | 30,215,000 | 34,158,000 | 26,508,000
Percentage of foreign subsidiaries' share equity |  | 65.00% |  |  |
Current portion of long-term debt |  | 50,000,000 | 50,000,000 |  |
Maximum aggregate short-term borrowings at any month-end |  | 191,000,000 | 141,000,000 |  |
Average aggregate short-term borrowings outstanding |  | 171,000,000 | 126,000,000 |  |
Weighted average interest rates |  | 1.55% | 1.20% | 1.40% |
Letters of Credit Outstanding, Amount |  | 13,000,000 | 15,300,000 |  |
Credit facility, maturity date |  |  | Nov. 30, 2012 |  |
Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Incremental term loan |  | 25,000,000 |  |  |
Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Incremental term loan |  | 250,000,000 |  |  |
JPMorgan Chase Bank N.A. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility | $ 450,000,000 |  |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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