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Long-term debt - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 30, 2013 USD ($) D | Mar. 30, 2013 CAD D | Dec. 11, 2012 USD ($) | Dec. 11, 2012 CAD | Mar. 31, 2012 USD ($)
Debt Disclosure [Abstract] |  |  |  |  |
Outstanding letters of credit | $ 1,700,000 |  |  |  | $ 1,800,000
Lease period | 20 | 20 |  |  |
Annual rent rate | $ 2,000,000 | 2,013,138 | $ 1,800,000 | 1,830,125 |
Increase in percentage of annual rent rate | 10.00% | 10.00% |  |  |
Condition for lease agreement | The Company has four options to renew and extend the term of the lease for four further terms of five years each, except for the last option which is five years less eleven days, terminating on November 30, 2040. Subject to specific terms and conditions, the Company also has two options to purchase the premises, which may be exercised no later than six months prior to the end of the fifteenth year of the term of the lease and the end of the twentieth year of the term of the lease, respectively. | The Company has four options to renew and extend the term of the lease for four further terms of five years each, except for the last option which is five years less eleven days, terminating on November 30, 2040. Subject to specific terms and conditions, the Company also has two options to purchase the premises, which may be exercised no later than six months prior to the end of the fifteenth year of the term of the lease and the end of the twentieth year of the term of the lease, respectively. |  |  |

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- Definition The percentage points added to the reference rate to compute the variable rate on the lessee's capital lease. + References No definition available. + Details
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- Details
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- Definition A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6394851&loc=SL2265659-115463 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 15 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6451445&loc=d3e32400-112679 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 01-8 -Paragraph 7, 8, 10, 14 -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph 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. + Details
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