Business Segments - Segment Activity (Details)	3 Months Ended		6 Months Ended
	Sep. 25, 2022 USD ($) item	Sep. 26, 2021 USD ($)	Sep. 25, 2022 USD ($) item segment	Sep. 26, 2021 USD ($)	Mar. 27, 2022 USD ($)
Segments
Number of reportable segments | segment			2
Market unit activity
Revenues	$ 120,512,900	$ 108,536,200	$ 232,674,100	$ 213,492,300
Gross Profit	24,184,900	19,795,700	46,548,300	39,482,000
Assets	$ 230,489,700		$ 230,489,700		$ 202,513,300
Minimum
Segments
Number manufacturers of products for which the Company is a distributor. | item	300		300
Corporate
Market unit activity
Assets	$ 145,806,000		$ 145,806,000		127,012,000
Carrier Segment
Market unit activity
Revenues	51,921,000	46,918,000	98,986,000	92,938,000
Gross Profit	6,870,000	5,560,000	13,135,000	10,881,000
Carrier Segment | Segments
Market unit activity
Assets	45,639,000		45,639,000		38,705,000
Commercial Segment
Market unit activity
Revenues	68,592,000	61,618,000	133,688,000	120,554,000
Gross Profit	17,315,000	$ 14,236,000	33,413,000	$ 28,601,000
Commercial Segment | Segments
Market unit activity
Assets	$ 39,045,000		$ 39,045,000		$ 36,797,000