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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Condensed Statements of Income (Detail) - Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (10,980)	$ (4,329)	$ 8,752
Gain (Loss) Reclassified from AOCI (Effective Portion)	(15,281)	3,142	6,236
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(12,531)	(805)	7,907
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	1,551	(3,524)	845
Cost of Sales | Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	(15,666)	5,860	5,803
Cost of Sales | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	$ 385	$ (2,718)	$ 433

X

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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+ References

No definition available.

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- Definition

Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

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