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Long-term Debt (Schedule of Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 3 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended
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Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 Domestic Line Of Credit [Member] | Sep. 30, 2013 Domestic Line Of Credit [Member] | Jun. 30, 2014 Series B Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series B Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series C Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series C Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series D Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series D Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series E Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series E Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series F Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series F Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series J Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series J Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series G Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series G Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series H Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series H Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series I Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series I Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series K Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series K Notes [Member] Notes Payable to Banks [Member] | Jun. 30, 2014 Series L Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series L Notes [Member] Notes Payable to Banks [Member] | Dec. 31, 2013 Domestic Line Of Credit [Member] | Jun. 30, 2014 Domestic Line Of Credit [Member] | Sep. 30, 2013 Domestic Line Of Credit [Member] | Jun. 30, 2014 Revolving Credit Facility [Member] | Jun. 30, 2014 Revolving Credit Facility [Member] Minimum [Member] | Jun. 30, 2014 Revolving Credit Facility [Member] Maximum [Member] | Jun. 30, 2014 Revolving Credit Agreement [Member] | Sep. 30, 2013 Revolving Credit Agreement [Member] | Jun. 30, 2014 Chinese Credit Facility, RMB Denominated Loan [Member] | Jun. 30, 2014
Long-term debt balance |  |  |  |  | $ 0 | $ 100,000 | $ 50,000 | $ 50,000 | $ 100,000 | $ 100,000 | $ 57,000 | $ 57,000 | $ 43,000 | $ 43,000 | $ 50,000 | $ 0 | $ 50,000 | $ 0 | $ 25,000 | $ 0 | $ 25,000 | $ 0 | $ 50,000 | $ 0 | $ 50,000 | $ 0 |  | $ 0 | $ 200,000 |  |  |  | $ 165,000 | $ 0 |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  | prime rate or an adjusted LIBOR |  |  |  |  |  | LIBOR |  | interest at the prevailing interest rate offered by the People's Bank of China on the date of borrowing, plus a margin equal to 25% of that prevailing rate | interest at the lender's cost of borrowing rate at the date of borrowing, plus 3%
Basis Spread On Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.85% | 1.65% |  |  |  |
Interest rate |  |  |  | 1.06% | 5.63% | 5.63% | 5.92% | 5.92% | 6.39% | 6.39% | 7.81% | 7.81% | 8.24% | 8.24% |  |  | 3.42% |  | 4.03% |  | 4.18% |  | 4.03% |  | 4.18% |  |  |  |  |  |  |  |  |  |  |
Credit facility effective interest rate on outstanding borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.20% |  |  |  |  |  |
Maturity date |  |  | Dec. 20, 2013 |  | Oct. 01, 2013 | Oct. 01, 2013 | Oct. 01, 2015 | Oct. 01, 2015 | Oct. 01, 2018 | Oct. 01, 2018 | Apr. 03, 2016 | Apr. 03, 2016 | Apr. 03, 2019 | Apr. 03, 2019 | Nov. 15, 2020 |  | Nov. 15, 2020 |  | Nov. 15, 2023 |  | Nov. 15, 2025 |  | Nov. 15, 2023 |  | Nov. 15, 2025 |  |  |  |  |  |  |  | Jul. 01, 2018 |  |  |
Total debt | 665,000 | 550,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | 0 | (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, excluding current portion | $ 665,000 | $ 450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying values as of the balance sheet date of the portions of all long-term notes and loans payable due within one year or the operating cycle if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, notes payable, long-term borrowings on lines of credit and borrowings on revolving credit facilities. Excludes capital lease obligations. + References No definition available. + Details
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