Business Segments (Details 2) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 27, 2015	Sep. 27, 2014	Sep. 27, 2015	Sep. 27, 2014
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	$ 142,353,300	$ 148,521,800	$ 277,017,300	$ 301,468,100
Gross profit	33,861,700	35,436,000	66,097,600	70,684,800
Base Station Infrastructure
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	56,275,000	64,129,000	110,098,000	127,016,000
Gross profit	14,938,000	16,817,000	30,257,000	33,892,000
Network Systems
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	22,425,000	27,496,000	43,619,000	58,040,000
Gross profit	3,943,000	4,174,000	7,611,000	8,859,000
Installation, Test and Maintenance
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	9,012,000	10,663,000	17,630,000	21,585,000
Gross profit	2,081,000	2,284,000	3,926,000	4,817,000
Mobile Device Accessories
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	54,641,000	46,234,000	105,670,000	94,827,000
Gross profit	$ 12,900,000	$ 12,161,000	$ 24,304,000	$ 23,117,000