Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details)	Sep. 30, 2016 JPY (¥) T	Sep. 30, 2016 HUF T	Sep. 30, 2016 USD ($) T	Sep. 30, 2016 KRW (₩) T
Contracts designated as hedging instruments | October 2016 - December 2016
Derivative [Line Items]
Notional Value of Copper Derivatives	117	117	117	117
Contracts designated as hedging instruments | January 2017 - March 2017
Derivative [Line Items]
Notional Value of Copper Derivatives	111	111	111	111
Contracts designated as hedging instruments | April 2017 - June 2017
Derivative [Line Items]
Notional Value of Copper Derivatives	103	103	103	103
Contracts designated as hedging instruments | July 2017 - September 2017
Derivative [Line Items]
Notional Value of Copper Derivatives	106	106	106	106
Contracts designated as hedging instruments | October 2017 - December 2017
Derivative [Line Items]
Notional Value of Copper Derivatives	83	83	83	83
Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward
Derivative [Line Items]
Notional Values of Foreign Currency Derivatives | $			$ 500,000
Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward
Derivative [Line Items]
Notional Values of Foreign Currency Derivatives | ₩				₩ 9,739,900,000
Contracts not designated as hedging instruments | JPY/USD | Foreign Exchange Forward
Derivative [Line Items]
Notional Values of Foreign Currency Derivatives | ¥	¥ 286,000,000
Contracts not designated as hedging instruments | JPY/USD | Foreign Exchange Forward
Derivative [Line Items]
Notional Values of Foreign Currency Derivatives | ¥	¥ 24,000,000
Contracts not designated as hedging instruments | HUF/EUR | Foreign Exchange Forward
Derivative [Line Items]
Notional Values of Foreign Currency Derivatives | HUF		HUF 228,000,000