XML 80 R70.htm IDEA: XBRL DOCUMENT v3.21.2

Related Party Transactions - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Percentage of accounts receivable due from and net sales	1.00%

X

- Definition

Percentage of accounts receivable due from and net sales.

+ References

No definition available.

+ Details

Name:	bldr_PercentageOfAccountsReceivableDueFromAndNetSales
Namespace Prefix:	bldr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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