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Derivative Financial Instruments - Additional Information (Detail) $ in Thousands, lb in Millions | 12 Months Ended
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Mar. 31, 2019 USD ($) lb | Mar. 31, 2018 USD ($) lb
Derivatives, Fair Value [Line Items] |  |
Foreign currency contract, maturity | 1 year |
Cost of Sales |  |
Derivatives, Fair Value [Line Items] |  |
Derivative gain (loss) to be recorded in income within 12 months, before tax | $ 46 |
Lead hedge forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Hedge forward contracts, maturity | 1 year |
Derivative, nonmonetary notional amount, mass | lb | 42.0 | 62.9
Total purchase price of derivative | $ 39,218 | $ 72,207
Designated as Hedging Instrument | Foreign currency forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 42,318 | 54,164
Not Designated as Hedging Instrument | Foreign currency forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | $ 22,201 | $ 28,486

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- Definition Maximum Term for Foreign Currency Forward Exchange Contracts + References No definition available. + 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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- 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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- 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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