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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

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

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-Publisher FASB
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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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

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-Section 50
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