Business Segments, Revenue Information by Product (Details) (USD $)	3 Months Ended
	Jun. 30, 2013	Jul. 01, 2012
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	$ 144,109,000	$ 192,418,000
Gross profit	35,437,900	35,493,200
Base Station Infrastructure [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	69,541,000	49,146,000
Gross profit	18,889,000	14,404,000
Network Systems [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	19,063,000	17,736,000
Gross profit	3,818,000	3,658,000
Installation, Test and Maintenance [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	9,762,000	10,640,000
Gross profit	2,350,000	2,540,000
Mobile Device Accessories [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	45,743,000	114,896,000
Gross profit	$ 10,381,000	$ 14,891,000