Schedule of Restructuring Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Severance	Sep. 30, 2012 Severance	Dec. 31, 2012 Severance
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period					$ 1,082		$ 360
Restructuring charges (reversal) to operations	(1)	372	1,065	372	(1)	1,200	1,140
Other adjustments							(87)
Cash payments					(114)		(446)
Balance as of December 31, 2012					$ 967	$ 1,082	$ 967

The charge against earnings in the period, comprised of costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding a discontinued operation as defined by generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, but excludes costs associated with the retirement of a long-lived asset and severance costs associated with established compensation plans.

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Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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