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Guarantees, Commitments and Contingencies (Details) $ in Millions	Dec. 29, 2018 USD ($)
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

X

- 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

X

- 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

X

- Details

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

X

- Details

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