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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details) | Mar. 31, 2017 JPY (¥) T | Mar. 31, 2017 EUR (€) T | Mar. 31, 2017 USD ($) T | Mar. 31, 2017 KRW (₩) T
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Contracts designated as hedging instruments | April 2017 - June 2017 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 122 | 122 | 122 | 122
Contracts designated as hedging instruments | July 2017 - September 2017 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 122 | 122 | 122 | 122
Contracts designated as hedging instruments | October 2017 - December 2017 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 122 | 122 | 122 | 122
Contracts designated as hedging instruments | January 2018 - March 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 56 | 56 | 56 | 56
Contracts designated as hedging instruments | April 2018 - June 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 25 | 25 | 25 | 25
Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | ₩ |  |  |  | ₩ 5,291,766,000
Contracts not designated as hedging instruments | USD/JPY | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | $ |  |  | $ 512,637 |
Contracts not designated as hedging instruments | JPY/EUR | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | ¥ | ¥ 338,000,000 |  |  |
Contracts not designated as hedging instruments | EUR/USD | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | € |  | € 3,914,930 |  |
Contracts not designated as hedging instruments | EUR/HUF | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | € |  | € 586,678 |  |
Contracts not designated as hedging instruments | USD/CNY | Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | $ |  |  | $ 6,083,500 |

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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 Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 + Details
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