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Derivative Financial Instruments - (Derivatives Designated as Cash Flow Hedges) (Details) - Derivatives Designated as Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 7,808	$ (11,386)	$ 4,101	$ (10,289)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	3,110	(3,308)	2,452	(3,522)
Lead forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	7,872	(11,524)	4,496	(11,009)
Lead forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	3,173	(3,742)	2,732	(2,719)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(64)	138	(395)	720
Foreign currency forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (63)	$ 434	$ (280)	$ (803)

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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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).

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