Derivative Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended										12 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2013 Not Designated as Hedging Instrument USD ($)	Mar. 31, 2012 Not Designated as Hedging Instrument USD ($)	Mar. 31, 2013 Cost of Sales USD ($)	Mar. 31, 2013 Interest rate swap agreements	Mar. 31, 2013 Interest rate swap agreements Other (Income) Expense Not Designated as Hedging Instrument USD ($)	Mar. 31, 2012 Interest rate swap agreements Other (Income) Expense Not Designated as Hedging Instrument USD ($)	Mar. 31, 2013 Lead hedge forward contracts GBP (£)	Mar. 31, 2012 Lead hedge forward contracts GBP (£)	Mar. 31, 2013 Foreign currency forward contracts USD ($)	Mar. 31, 2012 Foreign currency forward contracts USD ($)	Mar. 31, 2013 Foreign currency forward contracts Other (Income) Expense Not Designated as Hedging Instrument USD ($)	Mar. 31, 2012 Foreign currency forward contracts Other (Income) Expense Not Designated as Hedging Instrument USD ($)
Derivatives, Fair Value [Line Items]
Notional amount									£ 56,300	£ 60,000	$ 21,749	$ 11,410
Hedge forward contracts, maturity									1 year
Foreign currency forward contracts	51,366	42,121
Foreign currency contract, maturity	1 year
Derivative gain (loss) to be recorded in income within 12 months, before tax					1,389
Interest rate swap agreements converted into fixed rate basis	65,000	85,000
Derivative, maturity date						May 01, 2013
Change in fair value recorded in other (income) expense, net			101	977
(Gain) Loss Recognized in Income on Derivatives			$ (2,496)	$ 1,083			$ 101	$ 977					$ (2,597)	$ 106