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Income taxes - Additional Information (Detail) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2013 USD ($) | Mar. 31, 2012 USD ($) | Mar. 26, 2011 USD ($) | Mar. 30, 2013 Alternative Minimum Tax Credit [Member] USD ($) | Mar. 30, 2013 Domestic Tax Authority [Member] CAD | Mar. 30, 2013 Domestic Tax Authority [Member] Investment Tax Credits [Member] CAD | Mar. 30, 2013 Foreign Tax Authority [Member] USD ($) | Mar. 30, 2013 State and Local Jurisdiction [Member] USD ($) | Mar. 30, 2013 Section 382 Limitations [Member] USD ($)
Other Tax Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Accrued interest related to uncertain tax positions | $ 0 |  |  |  |  |  |  |  |
Non cash valuation allowance | (56,607,000) | (57,243,000) |  |  |  |  |  |  |
Federal tax payable | 5,800 | 25,000 | 25,000 |  |  |  |  |  |
Federal non capital losses |  |  |  |  | 19,300,000 |  | 106,400,000 | 97,600,000 |
Investment tax credits |  |  |  | 1,000,000 |  | 260,000 |  |  |
Expire date |  |  |  |  |  | Between 2022 and 2032 |  |  |
Pre-acquisition net operating loss |  |  |  |  |  |  |  |  | 35,300,000
Pre-acquisition net operating loss limited |  |  |  |  |  |  |  |  | $ 953,000
Federal net operating loss carry forwards expiration Dates |  |  |  |  |  |  | Beginning in fiscal 2020 through fiscal 2033 | Beginning in fiscal 2018 through fiscal 2033 |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(1) -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Section Appendix E -Paragraph 289 -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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