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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Inventories [Abstract]    
Raw materials $ 127,508 $ 93,037
Work in process 1,333 10,077
Finished goods 265,060 195,004
Inventories, net $ 393,901 $ 298,118