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Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016
Total debt | $ 698,241 | $ 729,244
Current portion of long-term debt | (134,300) | (150,000)
Unamortized debt issuance costs | (1,896) | (2,091)
Long-term debt, less current portion | $ 562,045 | $ 577,153
Series D Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 6.39% | 6.39%
Maturity date | Oct. 01, 2018 | Oct. 01, 2018
Total debt | $ 100,000 | $ 100,000
Series F Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 8.24% | 8.24%
Maturity date | Apr. 03, 2019 | Apr. 03, 2019
Total debt | $ 43,000 | $ 43,000
Series J Notes [Member] |  |
Variable interest rate | 2.30% |
Series J Notes [Member] | Notes Payable to Banks [Member] |  |
Basis Spread On Variable Rate | 1.25% | 1.25%
Maturity date | Nov. 15, 2020 | Nov. 15, 2020
Total debt | $ 50,000 | $ 50,000
Series G Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 3.42% | 3.42%
Maturity date | Nov. 15, 2020 | Nov. 15, 2020
Total debt | $ 50,000 | $ 50,000
Series H Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 4.03% | 4.03%
Maturity date | Nov. 15, 2023 | Nov. 15, 2023
Total debt | $ 25,000 | $ 25,000
Series I Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 4.18% | 4.18%
Maturity date | Nov. 15, 2025 | Nov. 15, 2025
Total debt | $ 25,000 | $ 25,000
Series K Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 4.03% | 4.03%
Maturity date | Nov. 15, 2023 | Nov. 15, 2023
Total debt | $ 50,000 | $ 50,000
Series L Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 4.18% | 4.18%
Maturity date | Nov. 15, 2025 | Nov. 15, 2025
Total debt | $ 50,000 | $ 50,000
Series M Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 1.12% | 1.12%
Maturity date | Sep. 23, 2026 | Sep. 23, 2026
Total debt | $ 42,735 | $ 44,886
Series N Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 1.31% | 1.31%
Maturity date | Sep. 23, 2028 | Sep. 23, 2028
Total debt | $ 82,265 | $ 86,406
Series O Notes [Member] | Notes Payable to Banks [Member] |  |
Interest rate | 1.57% | 1.57%
Maturity date | Sep. 23, 2031 | Sep. 23, 2031
Total debt | $ 45,941 | $ 48,252
Revolving Credit Facility [Member] |  |
Credit facility effective interest rate on outstanding borrowing | 2.03% | 1.77%
Revolving Credit Agreement [Member] |  |
Variable Rate Basis | LIBOR |
Revolving Credit Agreement [Member] | Domestic Line Of Credit [Member] |  |
Total debt | $ 134,300 | $ 156,700
Revolving Credit Agreement [Member] | Minimum [Member] |  |
Basis Spread On Variable Rate | 0.85% |
Revolving Credit Agreement [Member] | Maximum [Member] |  |
Basis Spread On Variable Rate | 1.65% |
Chinese Credit Facility, RMB Denominated Loan [Member] |  |
Variable Rate Basis | prevailing interest rate offered by the People's Bank of China on the date of borrowing, plus a margin equal to 15% of that prevailing rate |
Basis Spread On Variable Rate | 15.00% |
Chinese Credit Facility, USD Denominated Loan [Member] |  |
Variable Rate Basis | lender's cost of borrowing rate at the date of borrowing, plus 3% |
Basis Spread On Variable Rate | 3.00% |

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