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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 29, 2025 | Mar. 29, 2025 | Mar. 30, 2024 | Mar. 25, 2023
Tax Credit Carryforward [Line Items] |  |  |  |
Valuation allowance | $ 29,225 | $ 29,225 | $ 26,149 |
Current tax payable | 0 | $ 0 | $ 0 | $ 0
Financing Interest Expense | 8,100 |  |  |
Minimum [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Open tax year |  | 2018 |  |
Maximum [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Open tax year |  | 2025 |  |
Domestic Tax Authority [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal non capital losses | 55,100 | $ 55,100 |  |
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member] | Tax Year 2030 [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Capital losses | 3,400 | 3,400 |  |
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Capital losses | $ 1,600 | $ 1,600 |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- 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 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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