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Inventory (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011
Inventory [Abstract]
Raw materials	$ 10,279	$ 10,279		$ 17,100
Work-in-process	4,844	4,844		2,432
Finished goods	15,683	15,683		3,915
Deferred program costs	3,215	3,215		2,381
Net inventory	34,021	34,021		25,828
Inventory write-downs	$ 700	$ 2,150	$ 2,667

X

- Definition

Carrying amount as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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- Definition

Carrying amount as of the balance sheet date of inventories associated with long-term contracts or programs.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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- Definition

Carrying amount as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process. Also includes purchased parts that will be used as components of a finished product.

+ References

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Carrying amount as of the balance sheet date of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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