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Derivatives (Forward Contracts Not Designated as Hedging Instruments) (Details) - Mar. 31, 2018 - Not Designated as Hedging Instrument [Member] € in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, zł in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands | GBP (£) | USD ($) | PLN (zł) | EUR (€) | AUD ($) | CNY (¥) | JPY (¥) | BRL (R$)
--- | --- | --- | --- | --- | --- | --- | --- | ---
BRI/EUR 1 [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | R$ |  |  |  |  |  |  |  | R$ 45,094
BRI/EUR 1 [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | € 11,210 |  |  |  |
BRI/USD [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | R$ |  |  |  |  |  |  |  | R$ 74,534
BRI/USD [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | $ |  | $ 22,735 |  |  |  |  |  |
EUR/USD [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | 76,963 |  |  |  |
EUR/USD [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | $ |  | 95,421 |  |  |  |  |  |
EUR/PLN [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | 7,627 |  |  |  |
EUR/PLN [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | zł |  |  | zł 32,280 |  |  |  |  |
EUR/JPN [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | 5,772 |  |  |  |
EUR/JPN [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | ¥ |  |  |  |  |  |  | ¥ 763,515 |
EUR/CNY [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | 86,745 |  |  |  |
EUR/CNY [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | ¥ |  |  |  |  |  | ¥ 680,847 |  |
EUR/AUD [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | 11,573 |  |  |  |
EUR/AUD [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | $ |  |  |  |  | $ 18,600 |  |  |
EUR/GBP [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | £ 184 |  |  | 3,001 |  |  |  |
EUR/GBP [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | 2,642 |  |  | 161 |  |  |  |
GBP/USD [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | £ | £ 49 |  |  |  |  |  |  |
GBP/USD [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | $ |  | 70 |  |  |  |  |  |
PLN/EUR [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | zł |  |  | zł 70,770 |  |  |  |  |
PLN/EUR [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | € 16,740 |  |  |  |
JPN/USD [Member] | Short [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | ¥ |  |  |  |  |  |  | ¥ 371,342 |
JPN/USD [Member] | Long [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount | $ |  | $ 3,375 |  |  |  |  |  |

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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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