Long-term Debt (Schedule of Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Mar. 31, 2015	Sep. 30, 2014
Long-term debt balance	$ 713,000us-gaap_DebtInstrumentCarryingAmount	$ 710,000us-gaap_DebtInstrumentCarryingAmount
Current portion of long-term debt	0us-gaap_NotesAndLoansPayableCurrent	0us-gaap_NotesAndLoansPayableCurrent
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	1.51%
Series J Notes [Member] \| Notes Payable to Banks [Member]
Long-term debt balance	50,000	50,000
Variable Rate Basis	LIBOR
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	$ 213,000	$ 210,000
Revolving Credit Agreement [Member]
Variable Rate Basis	LIBOR
Credit facility effective interest rate on outstanding borrowing	1.23%	1.21%
Maturity date	Jul. 01, 2018
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	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%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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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)

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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

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

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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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Topic 210

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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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The effective interest rate at the end of the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.19(b),22(b))

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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)

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