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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. 31, 2018
Mar. 25, 2017
Mar. 26, 2016
Segment Reporting [Abstract]      
Unadjusted gross profit $ 45,159 $ 47,788 $ 54,443
Inventory provisions (1,114) (317) (721)
Other unallocated costs (551) (787) (1,065)
Adjustment of intercompany profit 60 98 312
Gross profit $ 43,554 $ 46,782 [1] $ 52,969 [1]
[1] Retrospectively revised (see note 18)