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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement Of Cash Flows [Abstract]
Non cash retirement of assets related to lease finance obligations	$ 5.9	$ 11.6
Non cash extinguishment of related lease finance obligation	5.9	11.6
Equipment purchased and financed through capital lease obligations	$ 9.9	$ 5.3

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- Definition

Non cash extinguishment of lease finance obligations due to asset retirements.

+ References

No definition available.

+ Details

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Namespace Prefix:	bldr_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Non cash retirement of assets which were subject to lease finance obligations.

+ References

No definition available.

+ Details

Name:	bldr_NonCashRetirementOfAssetsRelatedToLeaseFinanceObligations
Namespace Prefix:	bldr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The increase during the period in capital lease obligations due to entering into new capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

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

X

- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration