DEBT AND OTHER OBLIGATIONS - Revolving Credit Facility (Details) $ in Millions	Dec. 30, 2022 USD ($)
Debt Instrument [Line Items]
Maximum senior leverage ratio covenant	3
Credit Agreement \| Alternative Base Rate \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.90%
Credit Agreement \| Adjusted Daily Simple Secured Overnight Financing Rate (SOFR) \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Credit Agreement \| Adjusted Term Secured Overnight Financing Rate (SOFR) \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Line of Credit \| Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30.0
Incremental increase in interest rates in the event of default	2.00%
Line of Credit \| Credit Agreement \| Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 5.0
Expansion feature borrowing limit	$ 30.0

Debt Instrument, Covenant, Senior Leverage Ratio, Maximum

No definition available.

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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Incremental Increase In Interest Rate Due to Default

+ References

No definition available.

+ Details

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Namespace Prefix:	tls_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option

+ References

No definition available.

+ Details

Name:	tls_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption
Namespace Prefix:	tls_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

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 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=tls_AdjustedTermSecuredOvernightFinancingRateSOFRMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
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Balance Type:
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- Details

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Period Type: