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Financial instruments and risk management (Tables)

12 Months Ended

Mar. 31, 2013

Schedule of financial instruments with carrying amounts that differ from fair values

Financial instruments with carrying amounts that differ from their fair values are as follows:



	March 31, 2013				March 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Capital lease obligations ⁽ⁱ⁾	$	41,822	$	37,369	$	10,701	$	10,657
Series 1 Debentures ⁽ⁱⁱ⁾	225,000		220,079		225,000		203,624


(i)	The fair values of amounts due under capital leases are based on management estimates which are determined by discounting cash flows required under the instruments at the interest rates currently estimated to be available for instruments with similar terms.


(ii)	The fair value of the Series 1 Debentures is based upon the expected discounted cash flows and the period end market price of similar financial instruments.

Schedule of derivative financial instruments

Financial assets and liabilities measured at fair value net of accrued interest on a recurring basis, all of which are classified as Derivative financial instruments on the Consolidated Balance Sheets are summarized below:



March 31, 2013	Carrying Amount
Embedded price escalation features in certain long term supplier contracts	$	6,441
Less: current portion	(4,261		)
	$	2,180



March 31, 2012	Carrying Amount
Embedded price escalation features in certain long term supplier contracts	$	9,146
Less: current portion	(3,220		)
	$	5,926

Schedule of unrealized gains and losses on derivative financial instruments

The unrealized gains and losses on derivative financial instruments is comprised as follows:



Year ended March 31,	2013			2012			2011
Unrealized loss on cross-currency and interest rate swaps	$	—		$	—		$	2,111
Unrealized gain on embedded price escalation features in a long term customer construction contract	—			(5,877		)	(604		)
Unrealized (gain) loss on embedded price escalation features in certain long term supplier contracts	(2,705		)	3,495			(3,812		)
	$	(2,705	)	$	(2,382	)	$	(2,305	)

Schedule of non-financial assets measured at fair value on a non-recurring basis

Non-financial assets measured at fair value on a non-recurring basis as at March 31, 2013 and March 31, 2012 in the financial statements are summarized below:



	March 31, 2013					March 31, 2012
	Carrying Amount		Change in Fair Value			Carrying Amount		Change in Fair Value
Assets held for sale	$	157,464	$	(3,346	)	$	1,841	$	(8,748	)

Schedule of maximum exposure to credit risk for accounts receivable and unbilled revenue

The Company’s maximum exposure to credit risk for accounts receivable and unbilled revenue is as follows:



	March 31, 2013		March 31, 2012
Trade accounts receivables	$	93,451	$	213,051
Other receivables	7,018		1,078
Total accounts receivable	$	100,469	$	214,129
Unbilled revenue	$	56,183	$	86,859

Schedule of trade receivables aging

Payment terms are generally net 30 days. As at March 31, 2013 and March 31, 2012, trade receivables are aged as follows:



	March 31, 2013		March 31, 2012
Not past due	$	76,646	$	166,362
Past due 1-30 days	14,203		27,617
Past due 31-60 days	957		8,476
More than 61 days	1,645		10,596
Total	$	93,451	$	213,051

Schedule of changes to the allowance for uncollectible accounts

The allowance is an estimate of the March 31, 2013 trade receivable balances that are considered uncollectible. Changes to the allowance are as follows:



Year ended March 31,	2013			2012		2011
Opening balance	$	210		$	30	$	1,691
Payments received on provided balances	(1		)	—		(682		)
Current year allowance	365			180		518
Write-offs	(574		)	—		(1,497		)
Ending balance	$	—		$	210	$	30

Total revenues

Concentration Risk [Line Items]

Schedule of major customers

The following customers accounted for 10% or more of total revenues:



Year ended March 31,	2013		2012		2011
Customer A	25	%	15	%	30	%
Customer B	23	%	23	%	10	%
Customer C	17	%	6	%	—
Customer D	8	%	10	%	13	%
Customer E	6	%	31	%	38	%

Accounts receivable and unbilled revenue

Concentration Risk [Line Items]

Schedule of major customers

At March 31, 2013 and March 31, 2012, the following customers represented 10% or more of accounts receivable and unbilled revenue:



	March 31, 2013		March 31, 2012
Customer A	23	%	4	%
Customer B	20	%	31	%
Customer C	11	%	10	%
Customer D	11	%	4	%
Customer E	8	%	11	%

- Definition

Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).

+ References+ Details

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 14

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph c(2), d, e, f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 15

-Subparagraph b-d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 19

-Subparagraph a, b, c(1), d(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph a, c(1), c(2), c(3), d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

Reference 12: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

+ Details

- Definition

Tabular disclosure of all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. The disclosure concerning concentrations of risk may consist of the following information: (1) for concentrations of credit risk disclosure may include: (a) information about the (shared) activity, region, or economic characteristic that identifies the concentration, (b) the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity, (c) the policy of requiring collateral or other security to support financial instruments subject to credit risk, information about the entity's access to that collateral or other security, and the nature and a brief description of the collateral or other security supporting those financial instruments, and (d) the policy of entering into master netting arrangements to mitigate the credit risk of financial instruments, information about the arrangements for which the entity is a party, and a brief description of the terms of those arrangements, including the extent to which they would reduce the entity's maximum amount of loss due to credit risk and (2) for disclosure of quantitative information about the market risks of financial instruments that is consistent with the way the company manages or adjusts those risks, disclosure may include: (a) more details about current positions and perhaps activity during the period, (b) the hypothetical effects on comprehensive income (or net assets), or annual income, of several possible changes in market prices, (c) a gap analysis of interest rate re-pricing or maturity dates, (d) the duration of the financial instruments, (e) the entity's value at risk from derivatives and from other positions at the end of the reporting period and the average value at risk during the year, or (f) other ways of reporting quantitative information as internally developed.

+ References+ Details

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References+ Details

- Definition

Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.

+ References+ Details

- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

+ References+ Details