Borrowings Under Revolving Credit Facility (Details) - USD ($)		12 Months Ended
	Jun. 24, 2016	Mar. 26, 2017	Mar. 27, 2016	Mar. 29, 2015	Jun. 23, 2016
Credit Facility
Maturity period	5 years
Revolving Credit Facility
Credit Facility
Maximum borrowing capacity	$ 35,000,000
Outstanding principal balance		$ 0
Maximum aggregate commitment amount	$ 50,000,000
Borrowing base as a percent of Eligible Receivables minus Reserves	85.00%
Borrowing availability threshold	$ 10,000,000
Available borrowing capacity		35,000,000
Interest expense		45,500
Average borrowings during period		2,118,500
Maximum borrowings during period		$ 13,473,200
Commitment fee on unused portion of revolving credit facility (as a percent)		0.25%
Standby letters of credit
Credit Facility
Maximum borrowing capacity	5,000,000
Swingline loan
Credit Facility
Maximum borrowing capacity	$ 10,000,000
Minimum | Eurodollar rate | Revolving Credit Facility
Credit Facility
Interest rate spread on variable rate basis (as a percent)	1.50%
Maximum | Eurodollar rate | Revolving Credit Facility
Credit Facility
Interest rate spread on variable rate basis (as a percent)	1.75%
Revolving Credit Facility, Wells Fargo Bank, National Association and SunTrust Bank
Credit Facility
Maximum borrowing capacity					$ 35,000,000
Outstanding principal balance			$ 0		$ 0
Available borrowing capacity			$ 35,000,000
Weighted average interest rate (as a percent)		1.69%	1.65%
Interest expense			$ 59,000	$ 78,200
Average borrowings during period			3,454,500	4,672,300
Maximum borrowings during period			$ 12,301,100	$ 17,331,900
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%