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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]                      
Asset impairment charges $ 0us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 80.4us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 4.3us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 80.4us-gaap_AssetImpairmentCharges $ 4.3us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges
Goodwill impairment loss                 (4.4)us-gaap_GoodwillImpairmentLoss [1] 0us-gaap_GoodwillImpairmentLoss [1]  
Amortization of intangible assets                 60.0us-gaap_AmortizationOfIntangibleAssets 51.3us-gaap_AmortizationOfIntangibleAssets 44.3us-gaap_AmortizationOfIntangibleAssets
Estimated future intangible asset amortization expense 642.6us-gaap_IntangibleAssetsNetExcludingGoodwill       648.9us-gaap_IntangibleAssetsNetExcludingGoodwill       642.6us-gaap_IntangibleAssetsNetExcludingGoodwill 648.9us-gaap_IntangibleAssetsNetExcludingGoodwill  
AVC [Member]                      
Goodwill [Line Items]                      
Asset impairment charges     76.0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember		                
Impairment of intangible assets     74.7us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember		           74.7us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember		    
Impairment of property and equipment     1.3us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember		                
Goodwill impairment loss     (4.4)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember		           (4.4)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember		 [1] 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember		 [1]  
TECH [Member]                      
Goodwill [Line Items]                      
Weighted average percent for DCF approach                   50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForDiscountedCashFlowApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember		 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForDiscountedCashFlowApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember
Weighted average percent for EBITDA approach                   50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForEbitdaApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember		 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForEbitdaApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember
Weighted average cost of capital                   14.50%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAverageCostOfCapital
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember		 16.90%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAverageCostOfCapital
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember
Percentage of fair value in excess of carrying amount         23.80%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember		         23.80%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember		  
TECH [Member] | Minimum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                   7.0ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember		 7.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember
TECH [Member] | Maximum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                   8.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember		 8.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_TechnologyProductsMember
AQH [Member]                      
Goodwill [Line Items]                      
Asset impairment charges                   4.3us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		  
Goodwill impairment loss                 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 [1] 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 [1]  
Weighted average percent for DCF approach                 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForDiscountedCashFlowApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForDiscountedCashFlowApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		  
Weighted average percent for EBITDA approach                 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForEbitdaApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForEbitdaApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		  
Weighted average cost of capital                 12.90%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAverageCostOfCapital
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 13.20%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAverageCostOfCapital
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		  
Percentage of fair value in excess of carrying amount 48.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		       50.70%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		       48.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 50.70%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		  
AQH [Member] | Minimum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                 7ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 7.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		  
AQH [Member] | Maximum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                 7.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		 8.0ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AirQualityandHomeSolutionsAQHMember		  
ERG [Member]                      
Goodwill [Line Items]                      
Goodwill impairment loss                 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		 [1] 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		 [1]  
Weighted average percent for DCF approach                   50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForDiscountedCashFlowApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		  
Weighted average percent for EBITDA approach                   50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForEbitdaApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		  
Weighted average cost of capital                   13.40%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAverageCostOfCapital
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		  
Percentage of fair value in excess of carrying amount         39.50%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		         39.50%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		  
ERG [Member] | Minimum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                   6.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		  
ERG [Member] | Maximum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                   7.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember		  
SCS [Member]                      
Goodwill [Line Items]                      
Goodwill impairment loss                 $ 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		 [1] $ 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		 [1]  
Weighted average percent for DCF approach                 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForDiscountedCashFlowApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		    
Weighted average percent for EBITDA approach                 50.00%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAveragePercentForEbitdaApproach
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		    
Weighted average cost of capital                 11.70%ntks_ReportingUnitAnnualGoodwillImpairmentTestWeightedAverageCostOfCapital
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		    
Percentage of fair value in excess of carrying amount 46.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		               46.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		    
SCS [Member] | Minimum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                 7.5ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		    
SCS [Member] | Maximum [Member]                      
Goodwill [Line Items]                      
EBITDA multiple                 9ntks_ReportingUnitAnnualGoodwillImpairmentTestEBITDAmultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember		    
[1] Acquisition adjustments recorded during 2014 for the RCH segment relate to the acquisition of Reznor and Phoenix. Acquisition adjustments recorded during 2013 for the SCS and AVC segments relate to the acquisition of 2GIG and Gefen Distribution, respectively. See Note 2, “Acquisitions”.