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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 25, 2023 | Mar. 26, 2022
Tax Credit Carryforward [Line Items] |  |
Non cash valuation allowance | $ 24,820 | $ 22,660
Federal non capital losses | $ 45,937 |
Earliest Tax Year [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Open tax year | 2016 |
Latest Tax Year [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Open tax year | 2023 |
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Federal non capital losses | $ 45,900 |
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Capital losses | 200 |
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Capital losses | $ 1,400 |

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