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, 2020	Mar. 31, 2019	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (8,737)	$ (10,980)	$ (4,329)
Gain (Loss) Reclassified from AOCI (Effective Portion)	(1,151)	(15,281)	3,142
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(8,683)	(12,531)	(805)
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(54)	1,551	(3,524)
Cost of Sales | Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	(1,690)	(15,666)	5,860
Cost of Sales | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	$ 539	$ 385	$ (2,718)