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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (1,151)	$ (3,855)
Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(902)	(3,877)
Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(249)	22
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(1,151)	(3,855)
Significant Other Observable Inputs (Level 2) | Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(902)	(3,877)
Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (249)	$ 22

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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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.

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