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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Mar. 31, 2018	Mar. 25, 2017	Mar. 26, 2016
Income Tax Disclosure [Abstract]
Canadian statutory rate	26.60%	26.60%	26.60%
Rate differential for U.S. operations	0.40%	0.70%	(21.20%)
Utilization of unrecognized losses and other tax attributes	(27.10%)	(26.90%)	123.60%
Permanent differences and other	0.10%	(0.40%)	(129.00%)
Total	0.00%	0.00%	0.00%

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- Definition

Effective Income Tax Rate Reconciliation Effect Of Permanent Differences Other

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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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