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Accounts receivable
 12 Months Ended
Mar. 31, 2012
Accounts receivable [Abstract]  
Accounts receivable

7. Accounts receivable

 

                     
    

March 31,

2012

        

March 31,

2011

  

Accounts receivable – trade

     $180,917           $115,660  

Accounts receivable – holdbacks

     32,134           12,018  

Income and other taxes receivable

     –           397  

Accounts receivable – other

     1,288           437  

Allowance for doubtful accounts (note 21(d))

     (210 )          (30 ) 
      $214,129           $128,482  

Accounts receivable – holdbacks represent amounts up to 10% under certain contracts that the customer is contractually entitled to withhold until completion of the project or until certain project milestones are achieved. Holdbacks include $6,038 as of March 31, 2012 (March 31, 2011– $587) which relate to contracts whereby the normal operating cycle is greater than one year and therefore are not expected to be collected within a year.