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Revenue from Contracts with Customers - Change in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Contract assets increase (decrease)
Contract assets recognized		$ 888
Reclassification of contract assets to contra-revenue	$ (328)	(185)
Net change	(328)	703
Contract liabilities (increase) decrease
Contract liabilities recognized and recorded to contra-revenue as a result of performance obligations satisfied	(53,784)	(71,517)
Contract liabilities paid	66,851	73,522
Cash received in advance and not recognized as revenue	(41,567)	(33,520)
Reclassification of cash received in advance to revenue as a result of performance obligations satisfied	33,395	35,781
Net change	$ 4,895	$ 4,266

X

- Definition

Contract With Customer, Asset, Increase For Contract Assets Recognized In Period

+ References

No definition available.

+ Details

Name:	hni_ContractWithCustomerAssetIncreaseForContractAssetsRecognizedInPeriod
Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract With Customer, Asset, Net Increase (Decrease)

+ References

No definition available.

+ Details

Name:	hni_ContractWithCustomerAssetNetIncreaseDecrease
Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract With Customer, Asset, Reclassified To Contra Revenue

+ References

No definition available.

+ Details

Name:	hni_ContractWithCustomerAssetReclassifiedToContraRevenue
Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Cash Received In Advance, Not Recorded As Revenue

+ References

No definition available.

+ Details

Name:	hni_ContractWithCustomerLiabilityCashReceivedInAdvanceNotRecordedAsRevenue
Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Contract Liabilities Paid

+ References

No definition available.

+ Details

Name:	hni_ContractWithCustomerLiabilityContractLiabilitiesPaid
Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Net Increase (Decrease)

+ References

No definition available.

+ Details

Name:	hni_ContractWithCustomerLiabilityNetIncreaseDecrease
Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Performance Obligation Contra Revenue

+ References

No definition available.

+ Details

Name:	hni_ContractWithCustomerLiabilityPerformanceObligationContraRevenue
Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ChangeInContractWithCustomerAssetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ChangeInContractWithCustomerLiabilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration