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Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail)	12 Months Ended		12 Months Ended												12 Months Ended
	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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Capital Lease Term

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Interest Rate on Cash Advances

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Number Of Installment Of Term Loan

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The percentage points added to the reference rate to compute the variable rate on the lessor's capital lease (sales-type and direct financing leases).

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

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When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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.

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The amount of the monthly rental payments due under the lease entered into in connection with the transactions involving the sale of property to another party and the lease of the property back to the seller.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate.

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