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Other information (Details) (CAD) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Cash paid during the year for: |  |  |
Interest, including realized interest on interest rate swap | 29,783 | 27,521 | 33,559
Income taxes | 4,833 | 1,415 | 4,149
Cash received during the year for: |  |  |
Interest | 10 | 1 | 1,168
Income taxes | 518 | 5,347 | 2,260
Non-cash transactions: |  |  |
Acquisition of property, plant and equipment for continuing operations by means of capital leases | 42,229 | 7,215 | 427
Additions to assets held for sale | (2,995) | (10,322) | (1,675)
Decrease in property, plant and equipment resulting from reclassification to inventory | (2,219) | 0 | 0
Change in non-cash working capital related to piling discontinued operations, excluded from non-cash working capital for continuing operations: |  |  |
Accounts receivable, net | 71,212 | (1,819) | (5,257)
Unbilled revenue | 21,588 | 2,705 | (17,354)
Inventories | 3,215 | (11,577) | (930)
Prepaid expenses and deposits | 3,720 | 3,464 | 5,810
Accounts payable | (56,792) | 56,629 | (2,062)
Accrued liabilities | (1,621) | 2,167 | (5,566)
Billings in excess of costs incurred and estimated earnings on uncompleted contracts | 3,893 | 3,192 | (607)
Operating activities: |  |  |
Long term portion of liabilities related to equipment leases | (1,353) | (9,578) | (2,196)
Net changes in non-cash working capital | 43,862 | 45,183 | (28,162)
Buyout of contract related assets |  |  |
Non-cash transactions related to the buyout of contract-related assets during the year ended March 31, 2012: |  |  |
Disposition of property, plant and equipment related to the buyout of contract-related assets | 0 | (27,063) | 0
Disposition of intangible assets related to the buyout of contract-related assets | 0 | (1,119) | 0
Increase in accounts receivable related to the buyout of contract-related assets | 0 | 66,055 | 0
Decrease in unbilled revenue related to the buyout of contract-related assets | 0 | (16,457) | 0
Decrease in inventory related to the buyout of contract-related assets | 0 | (8,483) | 0
Increase in accounts payable related to the buyout of contract-related assets | 0 | 12,933 | 0
Restricted share units (RSUs) | Restricted share unit plan |  |  |
Non-cash transactions: |  |  |
(Decrease) increase in accrued liabilities related to current portion of RSU liability | (1,347) | 2,066 | 0
Deferred stock units (DSUs) | Directors' deferred share unit plan |  |  |
Non-cash transactions: |  |  |
(Decrease) increase in accrued liabilities related to current portion of RSU liability | 355 | 0 | 0
Purchase of property, plant and equipment |  |  |
Non-cash transactions: |  |  |
Net increase (decrease) in accounts payable related to purchase of property, plant and equipment | 4,294 | 1,380 | (3,879)
Net decrease in current portion of equipment lease liabilities included in accrued liabilities related to the purchase of property, plant and equipment | (1,574) | 0 | 0
Net decrease in long term portion of equipment lease liabilities related to the purchase of property, plant and equipment | (1,712) | 0 | 0
Continuing operations |  |  |
Non-cash transactions: |  |  |
Acquisition of property, plant and equipment for continuing operations by means of capital leases | 42,229 | 6,614 | 427
Discontinued operations |  |  |
Non-cash transactions: |  |  |
Acquisition of property, plant and equipment for continuing operations by means of capital leases | 6,512 | 601 | 0
Additions to assets held for sale | (152,470) | 0 | 0
Additions to liabilities held for sale from discontinued piling operations | 26,113 | 0 | 0
Change in non-cash working capital related to piling discontinued operations, excluded from non-cash working capital for continuing operations: |  |  |
Accounts receivable, net | 1,849 | 17,773 | 4,277
Unbilled revenue | 236 | 3,082 | 883
Inventories | 3,900 | 1,026 | 1,731
Prepaid expenses and deposits | (47) | 51 | 5,502
Accounts payable | 27,857 | (14,135) | (23,444)
Accrued liabilities | 103 | 252 | (132)
Billings in excess of costs incurred and estimated earnings on uncompleted contracts | 1,207 | (2,318) | (997)

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