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Income taxes - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 25, 2017 USD ($) | Mar. 25, 2017 CAD | Mar. 26, 2016 USD ($) | Mar. 28, 2015 USD ($)
Tax Credit Carryforward [Line Items] |  |  |  |
Accrued interest or penalties related to uncertain tax positions | $ 0 |  |  |
Non cash valuation allowance | 53,311,000 |  | $ 57,285,000 |
Reversal of valuation allowance | 5,300,000 |  |  |
Deferred income taxes | 5,303,000 |  |  |
Current tax receivable | $ (140,000) |  |  |
Current tax payable |  |  | $ 35,000 | $ 0
Minimum [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax assets realized period | 1 year |  |  |
Maximum [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax assets realized period | 3 years |  |  |
Alternative Minimum Tax Credit [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment tax credits | $ 1,100,000 |  |  |
Earliest Tax Year [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Open tax year | 2011 |  |  |
Latest Tax Year [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Open tax year | 2017 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal non capital losses | $ 18,300,000 | CAD 24,500,000 |  |
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment tax credits | $ 194,000 | CAD 260,000 |  |
Expire date | Between 2023 and 2036. |  |  |
Foreign Tax Authority [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal non capital losses | $ 106,000,000 |  |  |
Federal net operating loss carry forwards expiration Dates | Beginning in fiscal 2020 through fiscal 2034 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal non capital losses | $ 92,200,000 |  |  |
Federal net operating loss carry forwards expiration Dates | Beginning in fiscal 2018 through fiscal 2034 |  |  |
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 |  |  |

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