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Claims revenue
 12 Months Ended
Mar. 31, 2012
Claims revenue [Abstract]  
Claims revenue

20. Claims revenue

 

                                 
     2012         2011         2010  

Year ended March 31,

                                

Claims revenue recognized

     $35,211           $5,278           $4,541  

Claims revenue uncollected (classified as unbilled revenue)

     22,759           2,174           785