Business Segments - Segment Activity (Details)	12 Months Ended
Mar. 27, 2022 USD ($) item segment	Mar. 28, 2021 USD ($) segment	Mar. 29, 2020 USD ($)
Segments
Number of reportable segments \| segment	2	1
Market unit activity
Revenues	$ 417,544,800	$ 373,340,700	$ 409,014,400
Gross Profit	78,036,900	67,715,600	79,641,900
Assets	$ 202,513,300	189,077,900
Minimum
Segments
Number manufacturers of products for which the Company is a distributor. \| item	300
Corporate
Market unit activity
Assets	$ 127,012,000	125,893,000
Carrier Segment
Market unit activity
Revenues	180,740,000	149,825,000	156,395,000
Gross Profit	20,985,000	16,585,000	18,699,000
Carrier Segment \| Segments
Market unit activity
Assets	38,705,000	29,829,000
Commercial Segment
Market unit activity
Revenues	236,805,000	223,516,000	252,619,000
Gross Profit	57,052,000	51,131,000	$ 60,943,000
Commercial Segment \| Segments
Market unit activity
Assets	$ 36,797,000	$ 33,355,000

Number manufacturers of products for which the entity is a distributor.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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