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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 30, 2024	Mar. 25, 2023
Tax Credit Carryforward [Line Items]
Non cash valuation allowance	$ 26,149	$ 24,820
Federal non capital losses	$ 51,163
Minimum [Member]
Tax Credit Carryforward [Line Items]
Open tax year	2017
Maximum [Member]
Tax Credit Carryforward [Line Items]
Open tax year	2024
Domestic Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Federal non capital losses	$ 51,200
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	$ 1,500

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
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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- Definition

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

+ References

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- Definition

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.

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