Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jul. 04, 2026	Jan. 03, 2026
Revenue from Contract with Customer [Abstract]
Contract liability, customer deposits	$ 89.0	$ 102.9
Revenue recognized	$ 87.4

Contract With Customer, Liability, Customer Deposits, Revenue Recognized

No definition available.

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