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Goodwill - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2025
Goodwill [Line Items]
Goodwill amortization period	15 years

X

- Definition

Goodwill amortization period for tax purposes.

+ References

No definition available.

+ Details

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Namespace Prefix:	bldr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

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-Topic 350
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+ Details

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