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Long-term Debt (Schedule of Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Sep. 30, 2013
Total debt | $ 605,000 | $ 550,000
Current portion of long-term debt | 0 | (100,000)
Short-term Debt | 21,000 | 0
Long-term debt, excluding current portion | 584,000 | 450,000
Domestic Line Of Credit [Member] |  |
Interest rate |  | 1.06%
Maturity date | Dec. 20, 2013 |
Series B Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | 0 | 100,000
Interest rate | 5.63% | 5.63%
Maturity date | Oct. 01, 2013 | Oct. 01, 2013
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] | Notes Payable to Banks [Member] |  |
Long-term debt balance | 50,000 | 0
Debt Instrument, Description of Variable Rate Basis | LIBOR |
Basis Spread On Variable Rate | 1.25% |
Maturity date | Nov. 15, 2020 |
Series G Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | 50,000 | 0
Interest rate | 3.42% |
Maturity date | Nov. 15, 2020 |
Series H Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | 25,000 | 0
Interest rate | 4.03% |
Maturity date | Nov. 15, 2023 |
Series I Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | 25,000 | 0
Interest rate | 4.18% |
Maturity date | Nov. 15, 2025 |
Series K Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | 50,000 | 0
Interest rate | 4.03% |
Maturity date | Nov. 15, 2023 |
Series L Notes [Member] | Notes Payable to Banks [Member] |  |
Long-term debt balance | 50,000 | 0
Interest rate | 4.18% |
Maturity date | Nov. 15, 2025 |
Domestic Line Of Credit [Member] |  |
Long-term debt balance | 0 | 200,000
Debt Instrument, Description of Variable Rate Basis | prime rate or an adjusted LIBOR |
Revolving Credit Facility [Member] |  |
Credit facility effective interest rate on outstanding borrowing | 1.20% |
Long-term debt, excluding current portion | 84,000 |
Revolving Credit Facility [Member] | Minimum [Member] |  |
Debt Instrument, Description of Variable Rate Basis | 0.85% |
Revolving Credit Facility [Member] | Maximum [Member] |  |
Debt Instrument, Description of Variable Rate Basis | 1.65% |
Revolving Credit Agreement [Member] |  |
Long-term debt balance | 105,000 | 0
Debt Instrument, Description of Variable Rate Basis | LIBOR |
Short-term Debt | $ 21,000 |
Chinese Credit Facility, RMB Denominated Loan [Member] |  |
Debt Instrument, Description of 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] |  |
Debt Instrument, Description of Variable Rate Basis | interest at the lender's cost of borrowing rate at the date of borrowing, plus 3% |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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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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