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Inventory - Schedule of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 8,107us-gaap_InventoryRawMaterials	$ 3,304us-gaap_InventoryRawMaterials
Work-in-process	6,344us-gaap_InventoryWorkInProcess	4,047us-gaap_InventoryWorkInProcess
Finished goods	9,450us-gaap_InventoryFinishedGoods	10,275us-gaap_InventoryFinishedGoods
Deferred program costs	2,635us-gaap_InventoryForLongTermContractsOrPrograms	3,068us-gaap_InventoryForLongTermContractsOrPrograms
Net inventory	$ 26,536us-gaap_InventoryNet	$ 20,694us-gaap_InventoryNet

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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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-Publisher SEC

-Name Regulation S-X (SX)

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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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