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SEGMENT REPORTING - NARRATIVE (Details)	Sep. 30, 2017 item
SEGMENT REPORTING
Number of markets in which the entity Operates (in markets)	3

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- Definition

Number of Markets in which the Entity Operates

+ References

No definition available.

+ Details

Name:	ufpi_NumberofMarketsinwhichtheEntityOperates
Namespace Prefix:	ufpi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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