Business Segments - Segment Activity (Details)	3 Months Ended		9 Months Ended
	Dec. 25, 2022 USD ($) item	Dec. 26, 2021 USD ($)	Dec. 25, 2022 USD ($) segment item	Dec. 26, 2021 USD ($)	Mar. 27, 2022 USD ($)
Segments
Number of reportable segments | segment			2
Market unit activity
Revenues	$ 114,879,700	$ 102,462,400	$ 347,863,800	$ 315,954,700
Gross Profit	23,691,100	19,620,800	70,249,400	59,102,700
Total assets	$ 229,737,400		$ 229,737,400		$ 202,513,300
Minimum
Segments
Number manufacturers of products for which the Company is a distributor. | item	300		300
Corporate
Market unit activity
Total assets	$ 150,679,000		$ 150,679,000		127,012,000
Carrier Segment
Market unit activity
Revenues	48,627,000	43,409,000	147,745,000	136,348,000
Gross Profit	6,354,000	5,484,000	19,492,000	16,365,000
Carrier Segment | Segments
Market unit activity
Total assets	38,427,000		38,427,000		38,705,000
Commercial Segment
Market unit activity
Revenues	66,253,000	59,053,000	200,120,000	179,607,000
Gross Profit	17,337,000	$ 14,137,000	50,757,000	$ 42,738,000
Commercial Segment | Segments
Market unit activity
Total assets	$ 40,632,000		$ 40,632,000		$ 36,797,000