Percentage of assets purchases in the business combination.

No definition available.

Name:	ufpi_BusinessAcquisitionPercentageOfAssetsAcquired
Namespace Prefix:	ufpi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of net tangible assets acquired at the acquisition date.

+ References

No definition available.

+ Details

Name:	ufpi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetTangibleAssets
Namespace Prefix:	ufpi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

- Definition

Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

+ References

No definition available.

+ Details

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

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

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

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ufpi_PakRiteLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ufpi_NorthDivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ufpi_PalletPlaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ufpi_WesternDivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ufpi_NorthAmericanContainerCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ufpi_SouthDivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ufpi_FontanaWoodProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ufpi_ExpertPackagingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ufpi_SpinnerWoodProductsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ufpi_GreatNorthernLumberLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands								3 Months Ended
BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands	Oct. 22, 2018	Jul. 31, 2018	Jun. 01, 2018	Apr. 09, 2018	Apr. 03, 2018	Jan. 23, 2018	Jan. 15, 2018	Mar. 30, 2019
Business Acquisition
Aggregate acquisitions' revenue								$ 28,500
Aggregate acquisitions' operating profit								$ 1,200
Pak-Rite \| North
Business Acquisition
Purchase Price	$ 15,115
Percentage of assets purchased (as a percent)	100.00%
Intangible Assets	$ 8,592
Net Tangible Assets	6,523
Acquired entity, prior year sales	$ 15,000
Pallet Place \| West
Business Acquisition
Purchase Price		$ 1,016
Percentage of assets purchased (as a percent)		100.00%
Intangible Assets		$ 250
Net Tangible Assets		766
Acquired entity, prior year sales		$ 5,000
North American Container Corporation \| South
Business Acquisition
Purchase Price			$ 23,866
Percentage of assets purchased (as a percent)			100.00%
Intangible Assets			$ 12,497
Net Tangible Assets			11,369
Acquired entity, prior year sales			$ 71,000
Fontana Wood Products \| West
Business Acquisition
Purchase Price				$ 3,890
Percentage of assets purchased (as a percent)				100.00%
Intangible Assets				$ 2,235
Net Tangible Assets				1,655
Acquired entity, prior year sales				$ 12,000
Expert Packaging \| All Other
Business Acquisition
Purchase Price					$ 1,347
Percentage of assets purchased (as a percent)					100.00%
Intangible Assets					$ 1,287
Net Tangible Assets					60
Acquired entity, prior year sales					$ 3,600
Spinner Wood Products, LLC \| West
Business Acquisition
Purchase Price						$ 2,942
Percentage of assets purchased (as a percent)						100.00%
Intangible Assets						$ 850
Net Tangible Assets						2,092
Acquired entity, prior year sales						$ 8,000
Great Northern Lumber, LLC \| North
Business Acquisition
Purchase Price							$ 5,784
Percentage of assets purchased (as a percent)							100.00%
Intangible Assets							$ 50
Net Tangible Assets							5,734
Acquired entity, prior year sales							$ 25,000