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Long-term Debt (Schedule of Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended |  | 6 Months Ended | 12 Months Ended |  | 3 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Domestic Line Of Credit [Member] | Sep. 30, 2013 Domestic Line Of Credit [Member] | Mar. 31, 2013 2008 Term Loan [Member] | Mar. 31, 2013 2008 Term Loan [Member] Minimum [Member] | Mar. 31, 2013 2008 Term Loan [Member] Maximum [Member] | Sep. 30, 2014 Series B Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series B Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series C Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series C Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series D Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series D Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series E Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series E Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series F Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Series F Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series J Notes [Member] | Dec. 31, 2013 Series J Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series J Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series G Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series H Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series I Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series K Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2014 Series L Notes [Member] Notes Payable to Banks [Member] | Sep. 30, 2013 Domestic Line Of Credit [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] | Sep. 30, 2014 Revolving Credit Agreement [Member] | Sep. 30, 2014 Revolving Credit Agreement [Member] Minimum [Member] | Sep. 30, 2014 Revolving Credit Agreement [Member] Maximum [Member] | Sep. 30, 2014 Chinese Credit Facility, RMB Denominated Loan [Member] | Sep. 30, 2014
Long-term debt balance | $ 500,000 |  |  |  |  |  |  | $ 0 | $ 100,000 | $ 50,000 | $ 50,000 | $ 100,000 | $ 100,000 | $ 57,000 | $ 57,000 | $ 43,000 | $ 43,000 |  |  | $ 50,000 | $ 50,000 | $ 25,000 | $ 25,000 | $ 50,000 | $ 50,000 | $ 200,000 | $ 210,000 |  |  |  |  |
Variable interest rate |  |  |  | 1.06% |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | 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 |  |  |  |  |  | 1.00% | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  | 0.85% | 1.65% |  |
Interest rate |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.21% |  |  |  |
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 | 710,000 | 550,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | 0 | (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, excluding current portion | $ 710,000 | $ 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 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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