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Credit Facilities, Short-term Borrowings (Narrative) (Details) BRL in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 BRL | Mar. 31, 2016 BRL | Mar. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Short-term borrowings |  |  | $ 100,000 | $ 2,430 |
Long-term debt, excluding current portion |  |  | 617,000 | $ 850,000 |
Other Foreign Short-term Borrowings [Member] |  |  |  |  |
Outstanding borrowings |  |  | 0 |  |
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 |  |  |
Credit facility effective interest rate on outstanding borrowing | 1.68% | 1.68% | 1.68% | 1.44% |
Outstanding borrowings |  |  | $ 267,000 | $ 350,000 |
Short-term borrowings |  |  | 100,000 |  |
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 [Member] |  |  |  |  |
Maximum borrowing capacity |  |  | 22,700 |  | $ 22,700
Line of Credit Facility, Expiration Date |  | Sep. 01, 2016 |  |  |
Outstanding borrowings |  |  | 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 15% 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% |  |  |
Brazil Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Expiration Date | Jul. 26, 2016 |  |  |  |
Brazil Credit Facility BRL Denominated Loan [Member] |  |  |  |  |
Maximum borrowing capacity | BRL | BRL 52,000 | BRL 52,000 |  |  |
Variable Rate Basis |  | interest at the lender's cost of borrowing rate at the date of borrowing, plus 1.75% |  |  |
Outstanding borrowings |  |  | $ 0 | $ 2,430 |

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