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Retirement Benefits (Details) (USD $)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]      
Anual contributions by employer $ 26,800,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 23,300,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 20,800,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Stock contributions by employer 6,400,000hni_DefinedContributionPlanStockContributionsByEmployer 6,100,000hni_DefinedContributionPlanStockContributionsByEmployer 5,400,000hni_DefinedContributionPlanStockContributionsByEmployer
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension expense $ 167,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
$ 185,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
$ 281,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember