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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 25, 2023
Income Tax Disclosure [Abstract]
Canadian statutory rate	25.70%	25.70%	25.90%
Utilization of unrecognized losses and other tax attributes	(27.10%)	(28.60%)	(25.00%)
Non-deductible equity in earnings joint venture	2.40%	6.00%	4.00%
Permanent differences and other	(1.00%)	(3.10%)	(4.90%)
Total	0.00%	0.00%	0.00%

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- Definition

Effective income tax rate reconciliation effect of non deductible equity in earning joint venture.

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Effective Income Tax Rate Reconciliation Effect Of Permanent Differences Other

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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