Name:	tess_DebtInstrumentApplicableRateEventOfDefaultAdditionalIncrease
Namespace Prefix:	tess_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount of excess availability maintained under the credit facility.

No definition available.

Name:	tess_DebtInstrumentExcessAvailability
Namespace Prefix:	tess_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Number of financial covenants.

No definition available.

Name:	tess_DebtInstrumentFinancialCovenantNumber
Namespace Prefix:	tess_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The threshold amount of excess availability.

No definition available.

Name:	tess_DebtInstrumentThresholdExcessAvailability
Namespace Prefix:	tess_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the threshold fixed charge coverage ratio under the debt instrument covenant.

No definition available.

Name:	tess_DebtInstrumentThresholdFixedChargeCoverageRatio
Namespace Prefix:	tess_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Percentage of eligible accounts used in determining borrowing base as defined under the terms of the credit facility.

No definition available.

Name:	tess_LineOfCreditFacilityBorrowingBaseAsPercentageOfEligibleReceivables.
Namespace Prefix:	tess_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Amount used in determining borrowing base with regard to inventory under the terms of the credit facility.

No definition available.

Name:	tess_LineOfCreditFacilityBorrowingBaseFormulaAmount
Namespace Prefix:	tess_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Inventory age threshold used in determining borrowing base under the terms of the credit facility.

No definition available.

Name:	tess_LineOfCreditFacilityBorrowingBaseFormulaInventoryAge
Namespace Prefix:	tess_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The aggregate borrowing capacity under the credit facility, consisting of the maximum borrowing capacity plus the contingent increase, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

No definition available.

Name:	tess_LineOfCreditFacilityContingentIncreaseAggregateMaximumBorrowingCapacity
Namespace Prefix:	tess_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The percentage of maximum amount of credit facility used in calculating excess availability.

No definition available.

Name:	tess_LineOfCreditFacilityExcessAvailabilityPercentageOfMaximumAmountOfCreditFacility
Namespace Prefix:	tess_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the floor percentage under the debt instrument covenant.

No definition available.

Name:	tess_LineOfCreditFacilityFloorPercentage
Namespace Prefix:	tess_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The effective interest rate at the end of the reporting period.

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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.

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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

No definition available.

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_DebtInstrumentAxis=tess_RevolvingCreditFacility2020Member
Namespace Prefix:
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Name:	srt_RangeAxis=srt_MinimumMember
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Balance Type:
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Name:	srt_RangeAxis=srt_MaximumMember
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Data Type:	na
Balance Type:
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Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_StatementScenarioAxis=tess_DebtInstrumentCovenantIfFixedCoverageRatioIsLessThan1.10Member
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Name:	srt_StatementScenarioAxis=tess_DebtInstrumentCovenantIfFixedCoverageRatioIsGreaterThanOrEqualTo1.10Member
Namespace Prefix:
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Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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