Restructuring Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2012 Employee
Restructuring Cost and Reserve [Line Items]
Restructuring program number of positions eliminated or moved	12
Resturcturing charges related to severance costs	$ 603

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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