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Other information (Tables)
 12 Months Ended
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
)