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Income taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 30, 2019 | Mar. 31, 2018 | [1]
Tax Credit Carryforward [Line Items] |  |
Non cash valuation allowance | $ 19,276,000 | $ 13,562,000
Earliest Tax Year [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Open tax year | 2012 |
Latest Tax Year [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Open tax year | 2019 |
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Federal non capital losses | $ 48,200,000 |
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 | $ 1,200,000 |
[1] | Recast (refer to note 1)

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