Business Segments - Market Unit Activity (Details)	3 Months Ended	9 Months Ended
Dec. 27, 2015 USD ($)	Dec. 28, 2014 USD ($)	Dec. 27, 2015 USD ($) segment product	Dec. 28, 2014 USD ($)
Business Segments
Number of reportable segments \| segment			1
Number of product categories \| product			4
Market unit activity
Revenues	$ 139,510,700	$ 135,188,700	$ 416,528,000	$ 436,656,800
Gross profit	29,453,400	28,820,900	88,947,000	93,326,700
Income before provision for income taxes	4,655,500	2,622,800	12,067,900	14,484,000
Public Carrier, Contractor and Program Manager Market
Market unit activity
Revenues	22,381,000	22,847,000	73,335,000	105,118,000
Gross profit	3,678,000	4,283,000	12,485,000	17,006,000
Government System Operators
Market unit activity
Revenues	9,849,000	7,781,000	26,514,000	23,948,000
Gross profit	2,220,000	1,801,000	6,260,000	5,927,000
Private System Operators
Market unit activity
Revenues	21,634,000	25,422,000	66,712,000	67,705,000
Gross profit	5,093,000	5,599,000	16,293,000	16,332,000
Commercial Dealer and Reseller Market
Market unit activity
Revenues	32,566,000	30,786,000	100,109,000	105,850,000
Gross profit	8,706,000	8,060,000	26,289,000	27,539,000
Retailer, Independent Dealer Agents & Carriers
Market unit activity
Revenues	53,081,000	48,353,000	149,858,000	134,036,000
Gross profit	$ 9,756,000	$ 9,078,000	$ 27,620,000	$ 26,523,000

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

Name:	us-gaap_GrossProfit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationProfitLossAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_MajorCustomersAxis=tess_PublicCarrierContractorAndProgramManagerMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=tess_GovernmentSystemOperatorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=tess_PrivateSystemOperatorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=tess_CommercialDealerAndResellerMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=tess_RetailerIndependentDealerAgentsCarriersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: