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Inventories - Continuity of Obsolescence Reserve for Inventory (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 25, 2017
Mar. 26, 2016
Mar. 28, 2015
Inventory Disclosure [Abstract]      
Beginning balance $ 2,144 $ 2,746 $ 2,514
Additional charges 496 626 1,545
Deductions (954) (1,228) (1,313)
Ending balance $ 1,686 $ 2,144 $ 2,746