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Inventory (Tables)
3 Months Ended
Jun. 30, 2012
Inventory [Abstract]  
Schedule Of Inventory
    June 30,   March 31,
    2012   2012
Raw materials $ 10,117 $ 9,962
Work-in-process   3,749   2,390
Finished goods   12,893   14,438
Deferred program costs   1,940   2,466
Net inventory $ 28,699 $ 29,256