Business Segments - Product Category (Details) - USD ($)	3 Months Ended
Jun. 26, 2016	Jun. 28, 2015
Revenue and Gross Profit from External Customers
Revenues	$ 128,860,000	$ 134,664,000
Gross Profit	27,106,000	28,981,900
Base station infrastructure
Revenue and Gross Profit from External Customers
Revenues	52,395,000	53,823,000
Gross Profit	13,428,000	14,096,000
Network systems
Revenue and Gross Profit from External Customers
Revenues	18,430,000	21,194,000
Gross Profit	2,898,000	3,111,000
Installation, test and maintenance
Revenue and Gross Profit from External Customers
Revenues	8,755,000	8,618,000
Gross Profit	1,568,000	1,630,000
Mobile device accessories
Revenue and Gross Profit from External Customers
Revenues	49,280,000	51,029,000
Gross Profit	$ 9,212,000	$ 10,145,000

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.

No definition available.

+ Details

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

- Definition

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

+ 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 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales 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)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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

- Details

Name:	us-gaap_ProductOrServiceAxis=tess_BaseStationInfrastructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tess_NetworkSystemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tess_InstallationTestAndMaintenanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tess_MobileDeviceAccessoriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: