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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

X

- 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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X

- 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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X

- 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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X

- 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

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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

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- Details

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- Details

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