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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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Effect of Derivative Instruments on Consolidated Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Dedesignated As Hedging Instrument
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 1,871	$ (9,883)	$ 9,064
Gain (Loss) Reclassified from AOCI (Effective Portion)	5,012	(4,713)	190
Dedesignated As Hedging Instrument \| Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	1,623	(9,731)	15,930
Dedesignated As Hedging Instrument \| Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	248	(152)	(4,031)
Dedesignated As Hedging Instrument \| Interest rate swap agreements
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			(2,835)
Dedesignated As Hedging Instrument \| Cost of Sales \| Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	3,309	(831)	6,417
Dedesignated As Hedging Instrument \| Cost of Sales \| Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	1,703	(3,882)	471
Dedesignated As Hedging Instrument \| Interest Expense \| Interest Rate Contract
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)			(6,698)
Not Designated as Hedging Instrument \| Charges Related To Refinancing \| Interest Rate Contract
Derivatives, Fair Value [Line Items]
Location of Gain (Loss) Recognized in Income on Derivative			$ (5,847)