Business Segments (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 25, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 31, 2013 Segment Product	Apr. 01, 2012	Mar. 27, 2011
Business Segments [Abstract]
Number of reportable segments									2
Number of product categories									4
Segment Reporting Information [Line Items]
Revenues									$ 752,565,000	$ 733,390,000	$ 605,219,000
Gross profit	33,951,200	38,969,800	38,625,000	35,493,200	37,989,100	39,476,800	33,989,900	37,200,400	147,039,200	148,656,200	133,280,600
Directly allocatable expenses									70,522,000	71,453,000	78,576,000
Segment net profit contribution									76,517,000	77,203,000	54,705,000
Corporate support expenses									47,523,000	50,492,000	39,150,000
Income before provision for income taxes	4,665,200	8,729,800	8,726,000	6,873,400	5,727,000	7,807,000	5,757,100	7,419,800	28,994,400	26,710,900	15,554,900
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers									752,565,000	733,390,000	605,219,000
Gross profit	33,951,200	38,969,800	38,625,000	35,493,200	37,989,100	39,476,800	33,989,900	37,200,400	147,039,200	148,656,200	133,280,600
Base Station Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross profit									65,472,000	61,767,000	54,513,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers									227,510,000	196,611,000	192,587,000
Gross profit									65,472,000	61,767,000	54,513,000
Network Systems [Member]
Segment Reporting Information [Line Items]
Gross profit									14,887,000	15,817,000	12,108,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers									78,989,000	75,150,000	65,180,000
Gross profit									14,887,000	15,817,000	12,108,000
Installation, Test and Maintenance [Member]
Segment Reporting Information [Line Items]
Gross profit									11,151,000	10,365,000	10,744,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers									47,766,000	44,507,000	46,242,000
Gross profit									11,151,000	10,365,000	10,744,000
Mobile Device Accessories [Member]
Segment Reporting Information [Line Items]
Gross profit									55,529,000	60,707,000	55,916,000
Revenue and Gross Profit from External Customer [Line Items]
Revenue from external customers									398,300,000	417,122,000	301,210,000
Gross profit									55,529,000	60,707,000	55,916,000
Public Carriers, Contractors and Program Managers
Segment Reporting Information [Line Items]
Revenues									111,146,000	73,824,000	87,010,000
Gross profit									24,183,000	17,101,000	20,139,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									24,183,000	17,101,000	20,139,000
Private and Government System Operators
Segment Reporting Information [Line Items]
Revenues									121,313,000	129,129,000	108,520,000
Gross profit									33,596,000	35,860,000	28,978,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									33,596,000	35,860,000	28,978,000
Commercial Dealers and Resellers
Segment Reporting Information [Line Items]
Revenues									138,737,000	125,431,000	117,213,000
Gross profit									38,345,000	35,393,000	31,717,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									38,345,000	35,393,000	31,717,000
Retailer, Independent Dealer Agents and Carriers [Member]
Segment Reporting Information [Line Items]
Revenues									167,895,000	153,803,000	137,676,000
Gross profit									35,903,000	33,421,000	29,947,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									35,903,000	33,421,000	29,947,000
Revenue, excluding Major 3PL relationship [Member]
Segment Reporting Information [Line Items]
Revenues									539,091,000	482,187,000	450,419,000
Gross profit									132,027,000	121,775,000	110,781,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									132,027,000	121,775,000	110,781,000
Major 3PL relationship [Member]
Segment Reporting Information [Line Items]
Revenues									213,474,000	251,203,000	154,800,000
Gross profit									15,012,000	26,881,000	22,500,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									15,012,000	26,881,000	22,500,000
Commercial [Member]
Segment Reporting Information [Line Items]
Revenues									371,196,000	328,384,000	312,743,000
Gross profit									96,124,000	88,354,000	80,834,000
Directly allocatable expenses									42,821,000	41,490,000	47,096,000
Segment net profit contribution									53,303,000	46,864,000	33,738,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									96,124,000	88,354,000	80,834,000
Commercial [Member] | Public Carriers, Contractors and Program Managers
Segment Reporting Information [Line Items]
Revenues									111,146,000	73,824,000	87,010,000
Gross profit									24,183,000	17,101,000	20,139,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									24,183,000	17,101,000	20,139,000
Commercial [Member] | Private and Government System Operators
Segment Reporting Information [Line Items]
Revenues									121,313,000	129,129,000	108,520,000
Gross profit									33,596,000	35,860,000	28,978,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									33,596,000	35,860,000	28,978,000
Commercial [Member] | Commercial Dealers and Resellers
Segment Reporting Information [Line Items]
Revenues									138,737,000	125,431,000	117,213,000
Gross profit									38,345,000	35,393,000	31,717,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									38,345,000	35,393,000	31,717,000
Commercial [Member] | Retailer, Independent Dealer Agents and Carriers [Member]
Segment Reporting Information [Line Items]
Revenues									0	0	0
Gross profit									0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									0	0	0
Commercial [Member] | Revenue, excluding Major 3PL relationship [Member]
Segment Reporting Information [Line Items]
Revenues									371,196,000	328,384,000	312,743,000
Gross profit									96,124,000	88,354,000	80,834,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									96,124,000	88,354,000	80,834,000
Commercial [Member] | Major 3PL relationship [Member]
Segment Reporting Information [Line Items]
Revenues									0	0	0
Gross profit									0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									0	0	0
Retail [Member]
Segment Reporting Information [Line Items]
Revenues									381,369,000	405,006,000	292,476,000
Gross profit									50,915,000	60,302,000	52,447,000
Directly allocatable expenses									27,701,000	29,963,000	31,480,000
Segment net profit contribution									23,214,000	30,339,000	20,967,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									50,915,000	60,302,000	52,447,000
Retail [Member] | Public Carriers, Contractors and Program Managers
Segment Reporting Information [Line Items]
Revenues									0	0	0
Gross profit									0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									0	0	0
Retail [Member] | Private and Government System Operators
Segment Reporting Information [Line Items]
Revenues									0	0	0
Gross profit									0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									0	0	0
Retail [Member] | Commercial Dealers and Resellers
Segment Reporting Information [Line Items]
Revenues									0	0	0
Gross profit									0	0	0
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									0	0	0
Retail [Member] | Retailer, Independent Dealer Agents and Carriers [Member]
Segment Reporting Information [Line Items]
Revenues									167,895,000	153,803,000	137,676,000
Gross profit									35,903,000	33,421,000	29,947,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									35,903,000	33,421,000	29,947,000
Retail [Member] | Revenue, excluding Major 3PL relationship [Member]
Segment Reporting Information [Line Items]
Revenues									167,895,000	153,803,000	137,676,000
Gross profit									35,903,000	33,421,000	29,947,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									35,903,000	33,421,000	29,947,000
Retail [Member] | Major 3PL relationship [Member]
Segment Reporting Information [Line Items]
Revenues									213,474,000	251,203,000	154,800,000
Gross profit									15,012,000	26,881,000	22,500,000
Revenue and Gross Profit from External Customer [Line Items]
Gross profit									$ 15,012,000	$ 26,881,000	$ 22,500,000