Borrowings Under Revolving Credit Facility (Details) - USD ($)	12 Months Ended
	Mar. 27, 2016	Mar. 29, 2015	Mar. 30, 2014
Wells Fargo Bank, National Association and SunTrust Bank Credit Facility
Credit Facility
Maximum borrowing capacity, subject to lenders' discretion	$ 45,000,000
Revolving Credit Facility, Wells Fargo Bank, National Association and SunTrust Bank
Credit Facility
Maximum borrowing capacity	35,000,000
Dividend payment permitted by lender agreement	$ 9,000,000
Rolling dividend payment period under lender agreement	12 months
Stock repurchase permitted by lender agreement	$ 30,000,000
Purchase of additional shares of common stock	$ 11,700,000
Weighted average interest rate (as a percent)	1.69%	1.65%	2.35%
Interest expense	$ 59,000	$ 78,200	$ 53,400
Average borrowings during period	3,454,500	4,672,300	2,243,900
Maximum borrowings during period	12,301,100	17,331,900	$ 13,467,000
Amount outstanding	0	0
Available borrowing capacity	$ 35,000,000	$ 35,000,000
Revolving Credit Facility, Wells Fargo Bank, National Association and SunTrust Bank | Minimum | LIBOR
Credit Facility
Interest rate spread on variable rate basis (as a percent)	1.50%
Revolving Credit Facility, Wells Fargo Bank, National Association and SunTrust Bank | Maximum | LIBOR
Credit Facility
Interest rate spread on variable rate basis (as a percent)	2.50%