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Other information (Tables) | 12 Months Ended
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Mar. 31, 2013
Supplemental Cash Flow Elements [Abstract] |
Schedule of supplemental cash flow information | Supplemental cash flow information
Year ended March 31, |  | 2013 |  |  | 2012 |  |  | 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 |
Year ended March 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Non-cash transactions: |  |  |  |  |  |
Acquisition of property, plant and equipment for continuing operations by means of capital leases |  | $ | 42,229 |  |  | $ | 6,614 |  |  | $ | 427 |
Acquisition of property, plant and equipment for discontinued operations by means of capital leases |  | 6,512 |  |  | 601 |  |  | — |
Additions to assets held for sale |  | (2,995 | ) |  | (10,322 | ) |  | (1,675 | )
Additions to assets held for sale from discontinued piling operations |  | (152,470 | ) |  | — |  |  | — |
Additions to liabilities held for sale from discontinued piling operations |  | 26,113 |  |  | — |  |  | — |
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 | ) |  | — |  |  | — |
Net decrease in long term portion of equipment lease liabilities related to the purchase of property, plant and equipment |  | (1,712 | ) |  | — |  |  | — |
Decrease in property, plant and equipment resulting from reclassification to inventory |  | (2,219 | ) |  | — |  |  | — |
(Decrease) increase in accrued liabilities related to current portion of RSU liability |  | (1,347 | ) |  | 2,066 |  |  | — |
Increase in accrued liabilities related to current portion of DDSU liability |  | 355 |  |  | — |  |  | — |
Change in non-cash working capital related to piling discontinued operations, excluded from non-cash working capital for continuing operations: |  |  |  |  |  |
Accounts receivable |  | 1,849 |  |  | 17,773 |  |  | 4,277 |
Unbilled revenue |  | 236 |  |  | 3,082 |  |  | 883 |
Inventories |  | 3,900 |  |  | 1,026 |  |  | 1,731 |
Prepaid expenses |  | (47 | ) |  | 51 |  |  | 5,502 |
Accounts payable |  | 27,857 |  |  | (14,135 | ) |  | (23,444 | )
Accrued liabilities |  | 103 |  |  | 252 |  |  | (132 | )
Billings in excess of costs and earnings |  | 1,207 |  |  | (2,318 | ) |  | (997 | )
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 |  | — |  |  | (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 |  |  | — |
Schedule of net change in non-cash working capital | Net change in non-cash working capital
Year ended March 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Operating activities: |  |  |  |  |  |
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 | )
Long term portion of liabilities related to equipment leases |  | (1,353 | ) |  | (9,578 | ) |  | (2,196 | )
Billings in excess of costs incurred and estimated earnings on uncompleted contracts |  | 3,893 |  |  | 3,192 |  |  | (607 | )
|  | $ | 43,862 |  |  | $ | 45,183 |  |  | $ | (28,162 | )

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