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Income taxes - Additional Information (Detail) |  |  |  |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2014 USD ($) | Mar. 30, 2013 USD ($) | Mar. 31, 2012 USD ($) | Mar. 29, 2014 Alternative Minimum Tax Credit [Member] USD ($) | Mar. 29, 2014 Foreign Tax Authority [Member] USD ($) | Mar. 29, 2014 State and Local Jurisdiction [Member] USD ($) | Mar. 29, 2014 Foreign Country Section Three Eight Two Limitation [Member] USD ($) | Mar. 29, 2014 Domestic Tax Authority [Member] USD ($) | Mar. 29, 2014 Domestic Tax Authority [Member] CAD | Mar. 29, 2014 Domestic Tax Authority [Member] Investment Tax Credit Carryforward [Member] USD ($) | Mar. 29, 2014 Domestic Tax Authority [Member] Investment Tax Credit Carryforward [Member] CAD
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued interest related to uncertain tax positions | $ 0 |  |  |  |  |  |  |  |  |  |
Non cash valuation allowance | 56,809,000 | 56,607,000 |  |  |  |  |  |  |  |  |
Federal tax payable | 18,000 | 5,800 | 5,800 |  |  |  |  |  |  |  |
Federal non capital losses |  |  |  |  | 106,400,000 | 98,300,000 |  | 21,200,000 | 23,500,000 |  |
Investment tax credits |  |  |  | 1,000,000 |  |  |  |  |  | 235,000 | 260,000
Expire date |  |  |  |  |  |  |  |  |  | Between 2022 and 2032 | 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 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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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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