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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 26, 2011
Income Tax Disclosure [Abstract]
Canadian statutory rate	26.20%	27.50%	29.30%
Rate differential for U.S. operations	(7.30%)	(139.10%)	13.90%
Adjustment to valuation allowance	21.00%	493.90%	(62.40%)
Utilization of unrecognized losses and other tax attributes	(45.30%)	(395.50%)	17.80%
Permanent differences and other	6.70%	22.70%	1.10%
Total	1.30%	9.50%	(0.30%)

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Effective Income Tax Rate Reconciliation Effect Of Permanent Differences Other

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in all income tax contingencies, whether recorded or adjusted, during the period.

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