Credit Facilities, Short-term Borrowings (Narrative) (Details) BRL in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015 BRL	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Short-term borrowings			$ 100,000	$ 2,430
Long-term debt, excluding current portion			787,000	$ 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		1.67%	1.67%	1.44%
Outstanding borrowings			$ 437,000	$ 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
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