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Guarantees, Commitments and Contingencies (Details) $ in Millions | Dec. 29, 2018 USD ($)
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Financing instruments, insurance policies and payment obligations |
Guarantor Obligations [Line Items] |
Letters of credit | $ 24
Trade letters of credit and bankers' acceptances |
Guarantor Obligations [Line Items] |
Letters of credit | $ 2

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- 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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=hni_TradeLettersOfCreditAndBankersAcceptancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |