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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011
Inventories
Raw material	$ 10,162	$ 9,194	$ 10,232
Work-in-process	11,047	15,470	12,906
Finished goods	63,968	47,007	68,204
Inventory, net	$ 85,177	$ 71,671	$ 91,342

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, 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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