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Long-term debt - Additional Information (Detail) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 28, 2015 USD ($) | Mar. 28, 2015 CAD | Dec. 11, 2014 USD ($) | Dec. 11, 2014 CAD | Mar. 29, 2014 USD ($)
Debt Disclosure [Abstract] |  |  |  |  |
Outstanding letters of credit | $ 1.0 |  |  |  | $ 1.9
Lease period | 20 years |  |  |  |
Annual rent rate | $ 1.6 | CAD 2,013,138 | $ 1.6 | CAD 2,013,138 |
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. |  |  |  |

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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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- 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 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6394851&loc=SL2265659-115463 Reference 2: 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 3: 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 + Details
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