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Summary of Significant Accounting Policies (Self-Insurance) (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Accounting Policies [Abstract]
General, auto, product, and workers' compensation liabilities	$ 25,666	$ 26,233
Self-insured member health benefits liabilities	$ 6,000	$ 5,600

X

- Definition

Self Insurance Reserve, Member Health Benefits

+ References

No definition available.

+ Details

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Namespace Prefix:	hni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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