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Revenue from Contracts with Customers - Change in Contract Assets and Liabilities (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Contract assets increase (decrease) |
Contract assets recognized | $ 2,100
Reclassification of contract assets to contra revenue | (241)
Impact of business combination | 0
Net change | 1,859
Contract liabilities (increase) decrease |
Contract liabilities recognized and recorded to contra revenue as a result of performance obligations satisfied | (60,847)
Contract liabilities paid | 68,635
Cash received in advance and not recognized as revenue | (35,514)
Reclassification of cash received in advance to revenue as a result of performance obligations satisfied | 40,239
Impact of business combination | 640
Net change | $ 13,153

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_ChangeInContractWithCustomerAssetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ChangeInContractWithCustomerLiabilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, from business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration