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Long-term Debt (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2013 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2015 | Sep. 30, 2014
Debt financing costs |  |  | $ 2,359 | $ 1,297 |  |
Balance of unamortized debt issuance costs | $ 5,834 |  | $ 5,834 |  |  | $ 4,276
2008 Note Purchase Agreement [Member] |  |  |  |  |  |
Issuance Date |  |  | Oct. 01, 2008 |  |  |
2009 Note Purchase Agreement [Member] |  |  |  |  |  |
Issuance Date |  |  | Apr. 01, 2009 |  |  |
2013 Note Purchase Agreement [Member] |  |  |  |  |  |
Issuance Date |  |  | Oct. 01, 2013 |  |  |
Face Amount | $ 250,000 |  | $ 250,000 |  |  |
Debt financing costs |  | $ 1,297 |  |  |  |
Series J Notes [Member] |  |  |  |  |  |
Variable Rate Basis |  |  | LIBOR |  |  |
Basis Spread On Variable Rate |  |  | 1.25% |  |  |
Variable interest rate | 1.53% |  | 1.53% |  |  |
First Closing Notes [Member] |  |  |  |  |  |
Issuance Date |  |  | Oct. 01, 2013 |  |  |
Second Closing Notes [Member] |  |  |  |  |  |
Issuance Date |  |  | Nov. 15, 2013 |  |  |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |  |  |
Outstanding borrowings | $ 0 |  | $ 0 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
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% |  |  |
Chinese Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 22,700 |  | $ 22,700 |  |  | 22,700
Outstanding borrowings | $ 0 |  | $ 0 |  |  |
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% |  |  |
Revolving Credit Agreement [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 600,000 |
Outstanding borrowings |  |  |  |  |  | $ 210,000
Credit facility effective interest rate on outstanding borrowing |  |  |  |  |  | 1.21%
Amended Revolving Credit Agreement [Member] |  |  |  |  |  |
Variable interest rate | 1.24% |  | 1.24% |  |  |
Debt Covenant, Leverage Ratio, Maximum |  |  |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value | $ 800,000 |  | $ 800,000 |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income | 50.00% |  | 50.00% |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Proceeds of Issuance of Capital Stock | 50.00% |  | 50.00% |  |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum |  |  |  |  |  |
Line of Credit Facility, Initiation Date | Apr. 28, 2015 |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  | Apr. 28, 2020 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,000,000 |  | $ 1,000,000 |  |  |
Outstanding borrowings | $ 375,000 |  | $ 375,000 |  |  |
Credit facility effective interest rate on outstanding borrowing | 1.24% |  | 1.24% |  |  |
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% |  |  |

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