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Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) € in Thousands, BRL in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 BRL | Mar. 31, 2017 BRL | Mar. 31, 2017 EUR (€) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 BRL | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($)
Short-term borrowings |  |  |  | $ 134,300 |  |  | $ 150,000
Balance of unamortized debt issuance costs |  |  |  | 1,896 |  |  | $ 2,091
Other Foreign Short-term Borrowings [Member] |  |  |  |  |  |  |
Outstanding borrowings |  |  |  | $ 0 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Credit facility effective interest rate on outstanding borrowing | 2.03% | 2.03% | 2.03% | 2.03% |  |  | 1.77%
Outstanding borrowings |  |  |  | $ 134,300 |  |  | $ 156,700
Revolving Credit Agreement [Member] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 1,000,000 |  |  |
Option to increase maximum borrowings to this amount |  |  |  | 1,200,000 |  |  |
Line of Credit Facility, Expiration Date |  | Apr. 01, 2020 |  |  |  |  |
Variable Rate Basis |  | LIBOR |  |  |  |  |
Balance of unamortized debt issuance costs, line of credit |  |  |  | 2,697 |  |  | 3,134
Chinese Credit Facility [Member] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 4,550 |  | $ 22,700 |
Outstanding borrowings |  |  |  | 0 |  |  |
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% |  |  |  |  |
Brazil Credit Facility BRL Denominated Loan [Member] |  |  |  |  |  |  |
Maximum borrowing capacity | BRL | BRL 1,000 | BRL 1,000 |  |  | BRL 52,000 |  |
Line of Credit Facility, Expiration Date | Jul. 14, 2017 |  |  |  |  |  |
Variable Rate Basis |  | interest at the lender's cost of borrowing rate at the date of borrowing, plus 1.75% |  |  |  |  |
Basis Spread On Variable Rate |  | 1.75% |  |  |  |  |
Outstanding borrowings |  |  |  | 0 |  |  |
Minimum [Member] | Revolving Credit Agreement [Member] |  |  |  |  |  |  |
Basis Spread On Variable Rate |  | 0.85% |  |  |  |  |
Maximum [Member] | Revolving Credit Agreement [Member] |  |  |  |  |  |  |
Basis Spread On Variable Rate |  | 1.65% |  |  |  |  |
The Notes [Member] |  |  |  |  |  |  |
Balance of unamortized debt issuance costs |  |  |  | 1,896 |  |  | $ 2,091
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 |  |  |
First Closing Notes [Member] |  |  |  |  |  |  |
Issuance Date |  | Oct. 01, 2013 |  |  |  |  |
Second Closing Notes [Member] |  |  |  |  |  |  |
Issuance Date |  | Nov. 15, 2013 |  |  |  |  |
Series J Notes [Member] |  |  |  |  |  |  |
Variable interest rate | 2.30% | 2.30% | 2.30% | 2.30% |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |
Issuance Date |  | Sep. 23, 2016 |  |  |  |  |
Face Amount | € |  |  | € 160,000 |  |  |  |
Series M Notes [Member] |  |  |  |  |  |  |
Face Amount | € |  |  | 40,000 |  |  |  |
Series N Notes [Member] |  |  |  |  |  |  |
Face Amount | € |  |  | 77,000 |  |  |  |
Series O Notes [Member] |  |  |  |  |  |  |
Face Amount | € |  |  | € 43,000 |  |  |  |

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