Business Segments (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Business Segments [Abstract]
Number of reportable segments			2
Number of product categories			4
Segment Reporting Information [Line Items]
Revenues	$ 197,238,000	$ 148,837,000	$ 389,657,000	$ 312,352,000
Revenues, excluding Tier 1 carrier market	132,093,000	109,437,000	244,961,000	216,450,000
Gross profit	38,625,000	33,989,900	74,118,200	71,190,300
Gross profit, excluding Tier 1 carrier market	32,243,000	27,945,000	60,279,000	55,897,000
Directly allocatable expenses	18,085,000	17,023,000	35,342,000	33,864,000
Segment net profit contribution	20,540,000	16,967,000	38,776,000	37,326,000
Corporate support expenses	11,814,000	11,210,000	23,177,000	24,149,000
Income before provision for income taxes	8,726,000	5,757,100	15,599,400	13,176,900
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	197,238,000	148,837,000	389,657,000	312,352,000
Gross profit	38,625,000	33,989,900	74,118,200	71,190,300
Base Station Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross profit	16,756,000	14,928,000	31,160,000	29,903,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	57,034,000	49,464,000	106,180,000	96,672,000
Gross profit	16,756,000	14,928,000	31,160,000	29,903,000
Network Systems [Member]
Segment Reporting Information [Line Items]
Gross profit	3,980,000	3,771,000	7,638,000	7,645,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	22,166,000	19,140,000	39,902,000	38,613,000
Gross profit	3,980,000	3,771,000	7,638,000	7,645,000
Installation, Test and Maintenance [Member]
Segment Reporting Information [Line Items]
Gross profit	2,826,000	2,616,000	5,366,000	4,920,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	12,140,000	12,129,000	22,780,000	22,076,000
Gross profit	2,826,000	2,616,000	5,366,000	4,920,000
Mobile device accessories [Member]
Segment Reporting Information [Line Items]
Gross profit	15,063,000	12,675,000	29,954,000	28,722,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers	105,898,000	68,104,000	220,795,000	154,991,000
Gross profit	15,063,000	12,675,000	29,954,000	28,722,000
Public Carrier, Contractor and Program Manager Market [Member]
Segment Reporting Information [Line Items]
Revenues	25,811,000	20,065,000	45,829,000	38,231,000
Gross profit	5,635,000	4,309,000	10,093,000	8,658,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	5,635,000	4,309,000	10,093,000	8,658,000
Private System Operator and Government Market [Member]
Segment Reporting Information [Line Items]
Revenues	34,264,000	31,268,000	63,864,000	62,541,000
Gross profit	9,238,000	8,763,000	17,391,000	18,132,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	9,238,000	8,763,000	17,391,000	18,132,000
Commercial Dealer and Reseller Market [Member]
Segment Reporting Information [Line Items]
Revenues	35,655,000	31,257,000	67,263,000	60,136,000
Gross profit	9,801,000	8,962,000	18,599,000	17,112,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	9,801,000	8,962,000	18,599,000	17,112,000
Retailer, Dealer Agent and Tier 2-3 Carrier Market [Member]
Segment Reporting Information [Line Items]
Revenues	36,363,000	26,847,000	68,005,000	55,542,000
Gross profit	7,569,000	5,911,000	14,196,000	11,995,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	7,569,000	5,911,000	14,196,000	11,995,000
Tier 1 Carrier Market [Member]
Segment Reporting Information [Line Items]
Revenues, excluding Tier 1 carrier market	65,145,000	39,400,000	144,696,000	95,902,000
Gross profit, excluding Tier 1 carrier market	6,382,000	6,045,000	13,839,000	15,293,000
Commercial [Member]
Segment Reporting Information [Line Items]
Revenues	95,730,000	82,590,000	176,956,000	160,908,000
Revenues, excluding Tier 1 carrier market	95,730,000	82,590,000	176,956,000	160,908,000
Gross profit	24,674,000	22,034,000	46,083,000	43,902,000
Gross profit, excluding Tier 1 carrier market	24,674,000	22,034,000	46,083,000	43,902,000
Directly allocatable expenses	10,701,000	10,322,000	20,812,000	20,346,000
Segment net profit contribution	13,973,000	11,712,000	25,271,000	23,556,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	24,674,000	22,034,000	46,083,000	43,902,000
Commercial [Member] | Public Carrier, Contractor and Program Manager Market [Member]
Segment Reporting Information [Line Items]
Revenues	25,811,000	20,065,000	45,829,000	38,231,000
Gross profit	5,635,000	4,309,000	10,093,000	8,658,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	5,635,000	4,309,000	10,093,000	8,658,000
Commercial [Member] | Private System Operator and Government Market [Member]
Segment Reporting Information [Line Items]
Revenues	34,264,000	31,268,000	63,864,000	62,541,000
Gross profit	9,238,000	8,763,000	17,391,000	18,132,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	9,238,000	8,763,000	17,391,000	18,132,000
Commercial [Member] | Commercial Dealer and Reseller Market [Member]
Segment Reporting Information [Line Items]
Revenues	35,655,000	31,257,000	67,263,000	60,136,000
Gross profit	9,801,000	8,962,000	18,599,000	17,112,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	9,801,000	8,962,000	18,599,000	17,112,000
Commercial [Member] | Retailer, Dealer Agent and Tier 2-3 Carrier Market [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Gross profit	0	0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	0	0	0	0
Commercial [Member] | Tier 1 Carrier Market [Member]
Segment Reporting Information [Line Items]
Revenues, excluding Tier 1 carrier market	0	0	0	0
Gross profit, excluding Tier 1 carrier market	0	0	0	0
Retail [Member]
Segment Reporting Information [Line Items]
Revenues	101,508,000	66,247,000	212,701,000	151,444,000
Revenues, excluding Tier 1 carrier market	36,363,000	26,847,000	68,005,000	55,542,000
Gross profit	13,951,000	11,956,000	28,035,000	27,288,000
Gross profit, excluding Tier 1 carrier market	7,569,000	5,911,000	14,196,000	11,995,000
Directly allocatable expenses	7,384,000	6,701,000	14,530,000	13,518,000
Segment net profit contribution	6,567,000	5,255,000	13,505,000	13,770,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	13,951,000	11,956,000	28,035,000	27,288,000
Retail [Member] | Public Carrier, Contractor and Program Manager Market [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Gross profit	0	0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	0	0	0	0
Retail [Member] | Private System Operator and Government Market [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Gross profit	0	0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	0	0	0	0
Retail [Member] | Commercial Dealer and Reseller Market [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Gross profit	0	0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	0	0	0	0
Retail [Member] | Retailer, Dealer Agent and Tier 2-3 Carrier Market [Member]
Segment Reporting Information [Line Items]
Revenues	36,363,000	26,847,000	68,005,000	55,542,000
Gross profit	7,569,000	5,911,000	14,196,000	11,995,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit	7,569,000	5,911,000	14,196,000	11,995,000
Retail [Member] | Tier 1 Carrier Market [Member]
Segment Reporting Information [Line Items]
Revenues, excluding Tier 1 carrier market	65,145,000	39,400,000	144,696,000	95,902,000
Gross profit, excluding Tier 1 carrier market	$ 6,382,000	$ 6,045,000	$ 13,839,000	$ 15,293,000