Schedule II - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands		12 Months Ended
		Mar. 25, 2018	Mar. 26, 2017	Mar. 27, 2016
Balance at beginning of period		$ 457	$ 471	$ 443
Additions charged to costs and expenses		34	53	38
Additions charged to other accounts
Deductions	[1]	(23)	(67)	(10)
Balance at end of period		$ 468	$ 457	$ 471

[1] Uncollectible amounts written off.