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Inventory (Tables)
12 Months Ended
Mar. 31, 2012
Inventory [Abstract]  
Schedule Of Inventory
    March 31,
    2012   2011
Raw materials $ 9,962 $ 17,100
Work-in-progress   2,390   2,881
Finished goods   14,438   3,466
Deferred program costs   2,466   2,381
Inventory $ 29,256 $ 25,828