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Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Sep. 30, 2014
Long-term debt balance | $ 875,000 | $ 710,000
Short-term Debt | 3,186 | 0
Series C Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 50,000 | $ 50,000
Interest rate | 5.92% | 5.92%
Maturity date | Oct. 01, 2015 | Oct. 01, 2015
Series D Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 100,000 | $ 100,000
Interest rate | 6.39% | 6.39%
Maturity date | Oct. 01, 2018 | Oct. 01, 2018
Series E Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 57,000 | $ 57,000
Interest rate | 7.81% | 7.81%
Maturity date | Apr. 03, 2016 | Apr. 03, 2016
Series F Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 43,000 | $ 43,000
Interest rate | 8.24% | 8.24%
Maturity date | Apr. 03, 2019 | Apr. 03, 2019
Series J Notes [Member] |  |
Variable interest rate | 1.53% |
Variable Rate Basis | LIBOR |
Basis Spread On Variable Rate | 1.25% |
Series J Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 50,000 | $ 50,000
Basis Spread On Variable Rate | 1.25% | 1.25%
Maturity date | Nov. 15, 2020 | Nov. 15, 2020
Series G Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 50,000 | $ 50,000
Interest rate | 3.42% | 3.42%
Maturity date | Nov. 15, 2020 | Nov. 15, 2020
Series H Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 25,000 | $ 25,000
Interest rate | 4.03% | 4.03%
Maturity date | Nov. 15, 2023 | Nov. 15, 2023
Series I Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 25,000 | $ 25,000
Interest rate | 4.18% | 4.18%
Maturity date | Nov. 15, 2025 | Nov. 15, 2025
Series K Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 50,000 | $ 50,000
Interest rate | 4.03% | 4.03%
Maturity date | Nov. 15, 2023 | Nov. 15, 2023
Series L Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | $ 50,000 | $ 50,000
Interest rate | 4.18% | 4.18%
Maturity date | Nov. 15, 2025 | Nov. 15, 2025
Revolving Credit Facility [Member] |  |
Long-term debt balance | $ 375,000 | $ 210,000
Variable Rate Basis | LIBOR |
Revolving Credit Facility [Member] | Minimum [Member] |  |
Basis Spread On Variable Rate | 0.85% |
Revolving Credit Facility [Member] | Maximum [Member] |  |
Basis Spread On Variable Rate | 1.65% |
Revolving Credit Agreement [Member] |  |
Credit facility effective interest rate on outstanding borrowing |  | 1.21%
Amended Revolving Credit Agreement [Member] |  |
Variable interest rate | 1.24% |
Credit facility effective interest rate on outstanding borrowing | 1.24% |
Maturity date | Apr. 01, 2020 |
Amended Revolving Credit Agreement [Member] | Minimum [Member] |  |
Basis Spread On Variable Rate | 0.85% |
Amended Revolving Credit Agreement [Member] | Maximum [Member] |  |
Basis Spread On Variable Rate | 1.65% |
Chinese Credit Facility, RMB Denominated Loan [Member] |  |
Variable Rate Basis | 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 |
Chinese Credit Facility, USD Denominated Loan [Member] |  |
Variable Rate Basis | interest at the lender's cost of borrowing rate at the date of borrowing, plus 3% |

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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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -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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