Summary of Notional Amounts and Fair Values of Derivative Instruments on Consolidated Balance Sheet (Detail) (Forward Contracts, USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Mar. 31, 2012
Derivatives, Fair Value [Line Items]
Notional Amounts	$ 8,737	[1]	$ 11,203	[1]
Other Current Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	313		150
Accrued Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 22		$ 166

[1] Notional amounts represent the gross contract/notional amount of the derivatives outstanding.