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FAIR VALUE MEASUREMENT (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other Payments to Acquire Businesses   $ 5,000,000us-gaap_OtherPaymentsToAcquireBusinesses      
Intangible asset impairment charge 8,900,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 8,900,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill  
Income Approach Valuation Technique | Indefinite-lived intangible assets          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Royalty rate used in fair value estimation   5.00%knl_FairValueInputsRoyaltyRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
     
Discount rate used in fair value estimation   12.70%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
     
Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent Consideration, Fair Value Disclosure   16,000,000knl_ContingentConsiderationFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Recurring | Edelman Leather tradename          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Indefinite lived intangible assets recorded at fair value   17,150,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= knl_EdelmanLeatherMember
[1]      
Intangible asset impairment charge   8,900,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= knl_EdelmanLeatherMember
[1]      
Recurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent Consideration, Fair Value Disclosure   16,000,000knl_ContingentConsiderationFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Recurring | Level 3 | Edelman Leather tradename          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Indefinite lived intangible assets recorded at fair value   17,150,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= knl_EdelmanLeatherMember
[1]      
Edelman Leather tradename          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Intangible asset impairment charge 8,900,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ knl_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis
= knl_EdelmanLeatherMember
       
Indefinite-Lived Trade Names   $ 17,200,000us-gaap_IndefiniteLivedTradeNames
/ knl_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis
= knl_EdelmanLeatherMember
    $ 26,100,000us-gaap_IndefiniteLivedTradeNames
/ knl_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis
= knl_EdelmanLeatherMember
[1] The Company estimated the fair value of the indefinite-life intangible asset using the relief-from-royalty method under the income approach as of December 31, 2013. The Company used a royalty rate of 5.0% based on comparable market rates and a discount rate of 12.7%.