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Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail) | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
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Mar. 31, 2012 | Aug. 31, 2012 | Mar. 30, 2013 Capital leasing arrangements [Member] | Mar. 31, 2012 Capital leasing arrangements [Member] | Mar. 30, 2013 Term Loan From Investissement Of Quebec Prime Plus Five Point Five Percent [Member] USD ($) Installment | Mar. 30, 2013 Term Loan From Investissement Of Quebec Prime Plus Five Point Five Percent [Member] CAD | Mar. 31, 2012 Term Loan From Investissement Of Quebec Prime Plus Five Point Five Percent [Member] USD ($) Installment | Mar. 31, 2012 Term Loan From Investissement Of Quebec Prime Plus Five Point Five Percent [Member] CAD | Mar. 30, 2013 Revolving credit facility [Member] Senior Subordinated Loans [Member] | Mar. 31, 2012 Revolving credit facility [Member] Senior Subordinated Loans [Member] | Mar. 30, 2013 Cash contribution [Member] | Mar. 31, 2012 Cash contribution [Member] | Mar. 30, 2013 Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] | Mar. 31, 2012 Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] | Mar. 30, 2013 Repayment period one [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] USD ($) | Mar. 30, 2013 Repayment period one [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] CAD | Mar. 31, 2012 Repayment period one [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] USD ($) | Mar. 31, 2012 Repayment period one [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] CAD | Mar. 30, 2013 Repayment period two [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] USD ($) | Mar. 30, 2013 Repayment period two [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] CAD | Mar. 31, 2012 Repayment period two [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] USD ($) | Mar. 31, 2012 Repayment period two [Member] Term Loan From Investissement Of Quebec Prime Plus Three Point Five Percent [Member] CAD | Mar. 30, 2013 Land and Building [Member] Capital leasing arrangements [Member] USD ($) | Mar. 30, 2013 Land and Building [Member] Capital leasing arrangements [Member] CAD | Mar. 31, 2012 Land and Building [Member] Capital leasing arrangements [Member] USD ($) | Mar. 31, 2012 Land and Building [Member] Capital leasing arrangements [Member] CAD
Proforma Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured long term debt |  | 9.50% |  |  |  |  |  |  | 9.50% | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback transaction implicit annual interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.74% | 10.74% | 10.74% | 10.74%
Capital repayment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 months | 20 months | 20 months | 20 months | 40 months | 40 months | 40 months | 40 months |  |  |  |
Secured long term debt |  | 6.50% |  |  |  |  |  |  | 6.50% | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Repayment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,462 | 35,000 | $ 34,462 | 35,000 |  |  |  |  |  |  |  |
Line of Credit Facility Expiration Date | Jun. 30, 2015 |  |  |  |  |  |  |  | Jun. 30, 2015 | Jun. 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital lease period |  |  |  |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |  |  |  |  |  |  |  | 20 years | 20 years | 20 years | 20 years
Repayments Of Debt And Capital Lease Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 165,185 | 167,762 | 165,185 | 167,762
Annual rate of prime plus |  |  |  |  | 5.50% | 5.50% | 5.50% | 5.50% |  |  |  |  | 3.50% | 3.50% |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 48 | 48 | 48 | 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital repayments |  |  |  |  | 205,133 | 208,333 | 205,133 | 208,333 |  |  |  |  |  |  |  |  |  |  | 54,155 | 55,000 | 54,155 | 55,000 |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate Range Minimum |  |  | 6.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of term loan |  |  |  |  |  | 7,708,000 |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount of repayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 660,000 |  | 1,320,000 |  | 13,981,000 |  | 14,333,000
Debt Instrument Interest Rate Stated Percentage Rate Range Maximum |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on Cash advances |  |  |  |  |  |  |  |  |  |  | 11.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The financing cost related to leases that have been recorded under the deposit method, as a financing or as a capital leases in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Imputed Interest Rate -URI http://asc.fasb.org/extlink&oid=6515215 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -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. + Details
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