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Other information
 12 Months Ended
Mar. 31, 2012
Nature of Operations/Other information [Abstract]  
Other information

22. Other information

a) Supplemental cash flow information

 

                                 
Year ended March 31,   2012         2011         2010  

Cash paid during the year for:

                                

Interest, including realized interest on interest rate swap

     $27,521           $33,559           $49,999  

Income taxes

     1,415           4,149           10,395  

Cash received during the year for:

                                

Interest

     1           1,168           10,998  

Income taxes

     5,347           2,260           453  

Non-cash transactions:

                                

Acquisition of property, plant and equipment by means of capital leases

     7,215           427           1,523  

Additions to assets held for sale

     (10,322 )          (1,675 )          (1,739 ) 

Net increase (decrease) in accounts payable related to purchase of property, plant and equipment

     1,380           (3,879 )          1,840  

Disposition of property, plant and equipment related to the buy-out of contract-related assets

     (27,063 )          –           –  

Disposition of intangible assets related to the buyout of contract-related assets

     (1,119 )          –           –  

Increase in accounts receivable related to the buyout of contract-related assets

     66,055           –           –  

Decrease in unbilled revenue related to the buyout of contract-related assets

     (16,457 )          –           –  

Decrease in inventory related to the buyout of contract-related assets

     (8,483 )          –           –  

Increase in accounts payable related to the buyout of contract-related assets

     12,933           –           –  

Increase in accrued liabilities related to current portion of RSU liability

     2,066           –           –  

b) Net change in non-cash working capital

 

                                 
Year ended March 31,   2012         2011         2010  

Operating activities:

                                

Accounts receivable, net

     $(19,592 )          $(9,534 )          $(29,428 ) 

Unbilled revenue

     (377 )          (18,237 )          (28,795 ) 

Inventories

     (12,603 )          (2,661 )          6,214  

Prepaid expenses and deposits

     3,413           308           (2,620 ) 

Accounts payable

     70,764           21,382           6,620  

Accrued liabilities

     1,915           (5,434 )          1,150  

Long term portion of liabilities related to equipment leases

     (9,578 )          (2,196 )          7,809  

Billings in excess of costs incurred and estimated earnings on uncompleted contracts

     5,510           390           (541 ) 
      $39,452           $(15,982 )          $(39,591 )