Business Segments (Details)	3 Months Ended
Jun. 28, 2015 USD ($) segment product	Jun. 29, 2014 USD ($)
Business Segments
Number of reportable segments \| segment	1
Number of product categories \| product	4
Market Reporting Information [Line Items]
Revenues	$ 134,664,000	$ 152,946,300
Gross profit	32,235,900	35,248,800
Public Carrier, Contractor and Program Manager Market
Market Reporting Information [Line Items]
Revenues	25,151,000	41,418,000
Gross profit	5,053,000	7,193,000
Government System Operators
Market Reporting Information [Line Items]
Revenues	7,883,000	8,013,000
Gross profit	2,129,000	2,158,000
Private System Operators
Market Reporting Information [Line Items]
Revenues	22,022,000	20,991,000
Gross profit	6,163,000	5,755,000
Commercial Dealer and Reseller Market
Market Reporting Information [Line Items]
Revenues	33,488,000	38,284,000
Gross profit	9,532,000	10,637,000
Retailer, Independent Dealer Agents & Carriers
Market Reporting Information [Line Items]
Revenues	46,120,000	44,240,000
Gross profit	$ 9,359,000	$ 9,506,000

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

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- Details

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