Business Segments, Revenue Information by Product (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	$ 144,915,200	$ 204,458,700	$ 435,550,000	$ 594,115,200
Gross profit	36,142,400	38,969,800	108,073,100	113,088,000
Base Station Infrastructure [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	59,833,000	61,400,000	197,262,000	167,580,000
Gross profit	17,117,000	17,726,000	54,771,000	48,886,000
Network Systems [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	26,856,000	19,649,000	67,757,000	59,551,000
Gross profit	4,703,000	3,784,000	12,266,000	11,422,000
Installation, Test and Maintenance [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	13,681,000	13,357,000	36,031,000	36,137,000
Gross profit	3,073,000	3,077,000	8,203,000	8,443,000
Mobile Device Accessories [Member]
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	44,545,000	110,053,000	134,500,000	330,847,000
Gross profit	$ 11,249,000	$ 14,383,000	$ 32,833,000	$ 44,337,000