Name:	tnc_LineOfCreditFacilityCovenantRestrictionMaximumAcquisitionAmountWithHighLeverage
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The maximum Line of credit facility restrictive covenant on indebtedness to EBITDA ratio.

No definition available.

Name:	tnc_LineOfCreditFacilityCovenantRestrictionMaximumIndebtednessToEbitda
Namespace Prefix:	tnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The maximum leverage ratio allowed under line of credit facility restrictive covenant after acquisitions.

No definition available.

Name:	tnc_LineOfCreditFacilityCovenantRestrictionMaximumLeverageAfterAcquisitions
Namespace Prefix:	tnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The maximum leverage ratio allowed under line of credit facility restrictive covenant after the effect of paying dividends or repurchasing the company's stock.

No definition available.

Name:	tnc_LineOfCreditFacilityCovenantRestrictionMaximumLeverageAfterPayingDividendsOrRepuchasingStock
Namespace Prefix:	tnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The minimum Line of credit facility restrictive covenant on EBITDA to interest expense ratio.

No definition available.

Name:	tnc_LineOfCreditFacilityCovenantRestrictionMinimumEbitdaToInterestExpense
Namespace Prefix:	tnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of additional margin spread added to Federal Funds interest rate on Alternalte Base Rate ("ABR") borrowings.

No definition available.

Name:	tnc_LineOfCreditFacilityInterestRateMarginSpreadAddedToFederalFundsRate
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The amount of additional margin spread added to LIBOR one month interest rate on Alternate Base Rate borrowings.

No definition available.

Name:	tnc_LineOfCreditFacilityInterestRateMarginSpreadAddedToLiborRate
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The maximum fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

No definition available.

Name:	tnc_LineOfCreditFacilityMaximumCommitmentFeePercentage
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The maximum amount of additional margin spread added to LIBOR one month interest rate on Alternate Base Rate borrowings.

No definition available.

Name:	tnc_LineOfCreditFacilityMaximumInterestRateMarginSpreadAddedToLiborRate
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The minimum fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

No definition available.

Name:	tnc_LineOfCreditFacilityMinimumCommitmentFeePercentage
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The minimum amount of additional margin spread added to LIBOR one month interest rate on Alternate Base Rate borrowings.

No definition available.

Name:	tnc_LineOfCreditFacilityMinimumInterestRateMarginSpreadAddedToLiborRate
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Maximum interest rate spread added to adjusted LIBOR rate based on leverage ration on Eurocurrency borrowings (in hundreths).

No definition available.

Name:	tnc_MaximuminterestratespreadaddedtoadjustedLIBORratebasedonleveragerationonEurocurrencyborrowingsinhundreths
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths).

No definition available.

Name:	tnc_MinimuminterestratespreadaddedtoadjustedLIBORratebasedonleverageratioonEurocurrencyborrowingsinhundreths
Namespace Prefix:	tnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Face (par) amount of debt instrument at time of issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

Contractual interest rate for funds borrowed, under the debt agreement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Data Type:	xbrli:dateItemType
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Period Type:	duration

Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Data Type:	xbrli:dateItemType
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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
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Period Type:	duration

Weighted average interest rate of debt outstanding.

No definition available.

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

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://www.xbrl.org/2003/role/presentationRef

-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=6876686&loc=d3e534808-122878

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

-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=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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

Date the credit facility terminates, in CCYY-MM-DD format.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

Name:	us-gaap_LineOfCreditFacilityAxis=tnc_JpmorganChaseBankNationalAssociationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LineOfCreditFacilityAxis=tnc_AmendedPrudentialInvestmentManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LineOfCreditFacilityAxis=tnc_SeriesNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LineOfCreditFacilityAxis=tnc_SeriesBNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LineOfCreditFacilityAxis=tnc_RoyalBankOfScotlandNvMember
Namespace Prefix:
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