Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (3,497)	$ (3,941)
Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(654)	(3,872)
Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(2,832)	(851)
Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(11)	782
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(3,497)	(3,941)
Significant Other Observable Inputs (Level 2) | Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(654)	(3,872)
Significant Other Observable Inputs (Level 2) | Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(2,832)	(851)
Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (11)	$ 782