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Segmented Information - Schedule of Reconciliations of Segments Gross Profits and Certain Unallocated Costs to Consolidated Gross Profits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 27, 2021 | Mar. 28, 2020 | Mar. 30, 2019
Segment Reporting [Abstract] |  |  |
Unadjusted gross profit | $ 57,018 | $ 68,284 | $ 60,055
Inventory provisions | (736) | (475) | (686)
Other unallocated costs | 38 | (3,586) | (998)
Adjustment of intercompany profit | 30 | 254 | 206
Gross profit | $ 56,350 | $ 64,477 | $ 58,577

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