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Accounts receivable
 12 Months Ended
Mar. 31, 2013
Receivables [Abstract]  
Accounts receivable
Accounts receivable
 
 
March 31, 2013

 
March 31, 2012

Accounts receivable – trade
 
$
66,823

 
$
180,917

Accounts receivable – holdbacks
 
26,628

 
32,134

Income and other taxes receivable
 
3,375

 
—

Accounts receivable – other
 
3,643

 
1,288

Allowance for doubtful accounts (note 17(d))
 
—

 
(210
)
 
 
$
100,469

 
$
214,129


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. As of March 31, 2013 there were $nil holdback balances (March 31, 2012– $6,038) 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.