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Income taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 27, 2021 | Mar. 28, 2020
Tax Credit Carryforward [Line Items] |  |
Non cash valuation allowance | $ 24,565,000 | $ 22,475,000
Earliest Tax Year [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Open tax year | 2015 |
Latest Tax Year [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Open tax year | 2021 |
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Federal non capital losses | $ 52,000,000 |
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Capital losses | 260,000 |
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Capital losses | $ 1,400,000 |

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