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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, 2021	Mar. 31, 2020	Mar. 31, 2019
Derivatives, Fair Value [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ 332	$ (8,737)	$ (10,980)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(7,903)	(1,151)	(15,281)
Lead forward contracts
Derivatives, Fair Value [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	202	(8,683)	(12,531)
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	130	(54)	1,551
Cost of Sales | Lead forward contracts
Derivatives, Fair Value [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(7,411)	(1,690)	(15,666)
Cost of Sales | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (492)	$ 539	$ 385

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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- 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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- 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=118930883&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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-Section 45
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-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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