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Inventories
12 Months Ended
Mar. 31, 2012
Inventories [Abstract]  
Inventories

9. Inventories

 

                     
    

March 31,

2012

       

March 31,

2011

 

Spare tires

    $6,620           $3,794  

Job materials

    2,188           2,118  

Manufacturing raw materials

    1,669           926  

Finished goods

    1,378           897  
      $11,855           $7,735