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Inventory - Schedule of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 6,423	$ 5,966
Work-in-process	3,730	3,427
Finished goods	17,914	21,655
Deferred program costs	2,685	2,425
Net inventory	$ 30,752	$ 33,473

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves, and progress payments, of inventory associated with long-term contracts, expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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