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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
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