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Other long term obligations | 12 Months Ended
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Mar. 31, 2013
Other Liabilities Disclosure [Abstract] |
Other long term obligations | Other long term obligations a) Other long term obligations are as follows:
|  | March 31, 2013 |  |  | March 31, 2012 |
Liabilities related to equipment leases |  | $ | 104 |  |  | $ | 3,169 |
Deferred lease inducements (note 18(b)) |  | 440 |  |  | 547 |
Asset retirement obligation (note 18(c)) |  | 477 |  |  | 434 |
Senior executive stock option plan (note 24(c)) |  | 925 |  |  | 1,322 |
Restricted share unit plan (note 24(e)) |  | 2,768 |  |  | 3,170 |
Directors' deferred stock unit plan (note 24(f)) |  | 3,106 |  |  | 2,284 |
|  | $ | 7,820 |  |  | $ | 10,926 |
Less current portion of: |  |  |  |
Restricted share unit plan (note 24(e)) |  | (719 | ) |  | (2,066 | )
Directors' deferred share unit plan (note 24(f)) |  | (355 | ) |  | — |
|  | $ | 6,746 |  |  | $ | 8,860 |
b) Deferred lease inducements Lease inducements applicable to lease contracts are deferred and amortized as a reduction of general and administrative expenses on a straight-line basis over the lease term, which includes the initial lease term and renewal periods only where renewal is determined to be reasonably assured.
|  | March 31, 2013 |  |  | March 31, 2012 |
Balance, beginning of year |  | $ | 547 |  |  | $ | 654 |
Amortization of deferred lease inducements |  | (107 | ) |  | (107 | )
Balance, end of year |  | $ | 440 |  |  | $ | 547 |
c) Asset retirement obligation The Company recorded an asset retirement obligation related to the future retirement of a facility on leased land. Accretion expense associated with this obligation is included in equipment costs in the Consolidated Statements of Operations. The following table presents a continuity of the liability for the asset retirement obligation:
|  | March 31, 2013 |  |  | March 31, 2012 |
Balance, beginning of year |  | $ | 434 |  |  | $ | 395 |
Accretion expense |  | 43 |  |  | 39 |
Balance, end of year |  | $ | 477 |  |  | $ | 434 |
At March 31, 2013, estimated undiscounted cash flows required to settle the obligation were $1,084 (March 31, 2012 – $1,084). The credit adjusted risk-free rate assumed in measuring the asset retirement obligation was 9.42%. The Company expects to settle this obligation in 2021.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 24 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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