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Inventory - Schedule of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 6,936	$ 3,304
Work-in-process	6,073	4,047
Finished goods	8,750	10,275
Deferred program costs	2,701	3,068
Net inventory	$ 24,460	$ 20,694

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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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