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Income taxes - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 28, 2015 USD ($) | Mar. 28, 2015 CAD | Mar. 29, 2014 USD ($) | Mar. 30, 2013 USD ($)
Tax Credit Carryforward [Line Items] |  |  |  |
Accrued interest or penalties related to uncertain tax positions | $ 0 |  |  |
Non cash valuation allowance | 58,798,000 |  | $ 56,809,000 |
Federal tax payable | 0 |  | $ 18,000 | $ 5,800
Alternative Minimum Tax Credit [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment tax credits | 1,000,000 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal non capital losses | $ 106,500,000 |  |  |
Federal net operating loss carry forwards expiration Dates | Beginning in fiscal 2020 through fiscal 2034 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal non capital losses | $ 20,700,000 | CAD 26,100,000 |  |
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment tax credits | $ 207,000 | CAD 260,000 |  |
Expire date | Between 2022 and 2035 |  |  |
Foreign Country Section Three Eight Two Limitation [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Pre-acquisition net operating loss | $ 35,300,000 |  |  |
Pre-acquisition net operating loss limited | 953,000 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal non capital losses | $ 99,100,000 |  |  |
Federal net operating loss carry forwards expiration Dates | Beginning in fiscal 2018 through fiscal 2034 |  |  |

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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 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 + Details
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