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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. 25, 2017 | Mar. 26, 2016 | Mar. 28, 2015
Segment Reporting [Abstract] |  |  |
Unadjusted gross profit | $ 109,549 | $ 112,714 | $ 123,518
Inventory provisions | (1,250) | (2,084) | (3,151)
Other unallocated costs | (177) | (1,630) | (2,551)
Adjustment of intercompany profit | 312 | 387 | (11)
Gross profit | $ 108,434 | $ 109,387 | $ 117,805

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