Business Segment - Segment Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 27, 2020	Dec. 29, 2019
Market unit activity
Revenues	$ 99,237,600	$ 100,844,000	$ 284,607,600	$ 303,174,700
Gross Profit	17,316,000	19,647,000	50,890,000	60,053,000
Public carrier
Market unit activity
Revenues	42,923,000	37,793,000	114,810,000	110,448,000
Gross Profit	4,780,000	4,508,000	12,078,000	13,621,000
Value-added resellers and integrators
Market unit activity
Revenues	56,315,000	63,051,000	169,798,000	192,727,000
Gross Profit	$ 12,536,000	$ 15,139,000	$ 38,812,000	$ 46,432,000