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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Components of inventory    
Raw materials $ 12,826 $ 11,707
Work-in-process 159,247 164,438
Finished goods 21,243 28,721
Total inventories $ 193,316 $ 204,866 [1]
[1] Derived from audited financial statements