Foreign Currency Forward Contracts Subject to Master Netting Arrangements or Agreements between Company and Counterparty for Net Settlement of All Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Foreign Currency Forwards
Derivative [Line Items]
Gross Amount Recognized, Assets	$ 652	$ 792
Gross Amount Offset in the Balance Sheet, Assets	16	21
Net Amounts Presented in the Balance Sheet, Assets	636	771
Gross Amounts Not Offset in the Balance Sheet, Financial Instruments, Assets	604	659
Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received, Assets
Net Amount, Assets	32	112
Gross Amount Recognized, Liabilities	987	223
Gross Amount Offset in the Balance Sheet, Liabilities
Net Amounts Presented in the Balance Sheet, Liabilities	987	223
Gross Amounts Not Offset in the Balance Sheet, Financial Instruments, Liabilities	939	90
Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received, Liabilities
Net Amount, Liabilities	48	133
Interest Rate Swap Contracts
Derivative [Line Items]
Gross Amount Recognized, Liabilities	318	533
Gross Amount Offset in the Balance Sheet, Liabilities
Net Amounts Presented in the Balance Sheet, Liabilities	318	533
Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received, Liabilities
Net Amount, Liabilities	$ 318	$ 533