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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details) | Mar. 31, 2018 JPY (¥) T | Mar. 31, 2018 EUR (€) T | Mar. 31, 2018 USD ($) T | Mar. 31, 2018 KRW (₩) T
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Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | ₩ |  |  |  | ₩ 2,477,560,000
Contracts not designated as hedging instruments | JPY/EUR | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | ¥ | ¥ 310,000,000 |  |  |
Contracts not designated as hedging instruments | EUR/USD | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | € |  | € 8,081,989 |  |
Contracts not designated as hedging instruments | EUR/HUF | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | € |  | € 608,174 |  |
Contracts not designated as hedging instruments | USD/CNY | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ |  |  | $ 10,637,837 |
Contracts designated as hedging instruments | April 2018 - June 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of Copper Derivatives | 153 | 153 | 153 | 153
Contracts designated as hedging instruments | July 2018 - September 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of Copper Derivatives | 153 | 153 | 153 | 153
Contracts designated as hedging instruments | October 2018 - December 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of Copper Derivatives | 162 | 162 | 162 | 162
Contracts designated as hedging instruments | January 2019 - March 2019 |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of Copper Derivatives | 56 | 56 | 56 | 56
Contracts designated as hedging instruments | April 2019 - June 2019 |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of Copper Derivatives | 56 | 56 | 56 | 56

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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