v3.20.2

PREFERRED STOCK (Details) $ / shares in Units, $ in Millions	Jul. 21, 2020 USD ($) day $ / shares Rate shares	Sep. 30, 2020 $ / shares	Dec. 31, 2019 $ / shares
Class of Stock [Line Items]
Convertible preferred stock, par value (USD per share)		$ 1.00
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Series A Convertible Preferred Stock \| Investment Agreement
Class of Stock [Line Items]
Number of shares issued in transaction (in shares) \| shares	164,000
Convertible preferred stock, par value (USD per share)	$ 1.00
Aggregate purchase price \| $	$ 164.0
Proceeds received from issuance of preferred stock, net of transaction costs \| $	$ 161.8
Liquidation preference per share (in dollars per share)	$ 1,000
Cumulative dividend rate	4.50%
Conversion price per share (in dollars per share)	$ 16.75
Common stock, volume weighted average price per share (USD per share)	$ 29.3125
Preferred stock, convertible, threshold trading days \| day	20
Preferred stock, convertible, threshold consecutive trading days \| day	30
Preferred stock, conversion price, after sixth anniversary \| Rate	110.00%
Preferred stock, conversion price, after seventh anniversary \| Rate	105.00%
Preferred stock, conversion price, after eight anniversary \| Rate	100.00%
Change in control, redemption price, percentage \| Rate	100.00%
Beneficial ownership requirement \| Rate	50.00%

Temporary Equity, Beneficial Ownership Requirement

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityBeneficialOwnershipRequirement
Namespace Prefix:	knl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Change In Control, Redemption Price, Percentage

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityChangeInControlRedemptionPricePercentage
Namespace Prefix:	knl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Common Stock Volume Weighted Average Price Per Share, Company Conversion Election Threshold

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityCommonStockVolumeWeightedAveragePricePerShareCompanyConversionElectionThreshold
Namespace Prefix:	knl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Company Conversion Election, Threshold Consecutive Trading Days

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityCompanyConversionElectionThresholdConsecutiveTradingDays
Namespace Prefix:	knl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Company Conversion Election, Trading Days Threshold

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityCompanyConversionElectionTradingDaysThreshold
Namespace Prefix:	knl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Conversion Price, After Eight Anniversary

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityConversionPriceAfterEightAnniversary
Namespace Prefix:	knl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Conversion Price, After Seventh Anniversary

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityConversionPriceAfterSeventhAnniversary
Namespace Prefix:	knl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Conversion Price, After Sixth Anniversary

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityConversionPriceAfterSixthAnniversary
Namespace Prefix:	knl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity , Dividend Rate, Percentage

+ References

No definition available.

+ Details

Name:	knl_TemporaryEquityDividendRatePercentage
Namespace Prefix:	knl_
Data Type:	num: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_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face amount or stated value per share of common stock.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityLiquidationPreferencePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (27)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquityParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

+ Details

Name:	us-gaap_TemporaryEquityRedemptionPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_ConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=knl_InvestmentAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

KNOLL INC 10-Q