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- Derivative Financial Instruments (Additional Information) (Details) $ in Thousands, lb in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) lb | Mar. 31, 2018 USD ($) lb
Cost of Sales |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency cash flow hedge loss to be reclassified during next 12 months | $ 11,114 |
Lead forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount in pounds | lb | 68.9 | 62.9
Fair value of hedges, net | $ 67,543 | $ 72,207
Foreign currency forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 54,742 | 54,164
Foreign currency forward contracts | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | $ 31,128 | $ 28,486
Maximum | Lead forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, remaining maturity | 1 year |

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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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- Definition The weight of a commodity or material specified in an investment contract. For this element, weight may be specified using units of weight (such as pounds) or units of mass (such as kilograms) since in commercial practice, the term 'weight' tends to be interchangeable with 'mass'. + References No definition available. + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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