Maximum percentage of net sales attributable to single customer.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Number of geographic regions in which entity operates.

+ References

No definition available.

+ Details

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Namespace Prefix:	bldr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of locations the entity operates.

+ References

No definition available.

+ Details

Name:	bldr_NumberOfLocations
Namespace Prefix:	bldr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of top sales customers.

+ References

No definition available.

+ Details

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

- Definition

Percentage of material purchases from largest single supplier.

+ References

No definition available.

+ Details

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

- Definition

Percentage of revenue from installation and construction services.

+ References

No definition available.

+ Details

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

- Definition

Valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) for credit memos, and customer returns.

+ References

No definition available.

+ Details

Name:	bldr_ReserveForCreditMemosAndCustomerReturns
Namespace Prefix:	bldr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cost incurred during the reporting period in transporting goods and services to customers.

+ References

No definition available.

+ Details

Name:	bldr_ShippingAndHandlingCosts
Namespace Prefix:	bldr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Significant accounting policies.

+ References

No definition available.

+ Details

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

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

+ References

No definition available.

+ Details

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

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123364984&loc=d3e1205-110223

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Name:	us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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

- Definition

Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=bldr_SeniorSecuredNotesDueTwoThousandThirtyMember
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Data Type:	na
Balance Type:
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- Details

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Name:	us-gaap_DebtInstrumentAxis=bldr_SeniorSecuredNotesDueTwoThousandAndTwentySevenMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bldr_SeniorSecuredNotesDueTwoThousandAndThirtyTwoMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=bldr_OtherReceivablesAndOtherAssetsMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=bldr_ComputerSoftwareCostsMember
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- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
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- Details

Name:	srt_MajorCustomersAxis=bldr_TopTenCustomersMember
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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Store States Region Segment Customer shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Significant Accounting Policies [Line Items]
Number of Locations \| Store	565
Number of states \| States	42
Number of geographic regions \| Region	3
Number of operating segments \| Segment	3
Number of reportable segment \| Segment	1
Sales return reserve	$ 17.7	$ 11.9
Insurance reserve balance	$ 171.1	$ 90.8
Options granted \| shares	0	0	0
2030 Notes \| Level 2
Significant Accounting Policies [Line Items]
Fair value of long term debt	$ 590.9
2027 Notes \| Level 2
Significant Accounting Policies [Line Items]
Fair value of long term debt	646.2
2032 Notes \| Level 2
Significant Accounting Policies [Line Items]
Fair value of long term debt	1,045.0
Other Long-term Liabilities
Significant Accounting Policies [Line Items]
Insurance reserve balance	103.0	$ 52.1
Other Receivables and Other Assets
Significant Accounting Policies [Line Items]
Insurance receivable for claims that exceeds stop-loss limits	$ 12.6	5.7
Leasehold Improvements
Significant Accounting Policies [Line Items]
Leasehold improvements	The shorter of the estimated useful life or the remaining lease term
Computer Software
Significant Accounting Policies [Line Items]
Estimated useful lives	3 years
Shipping and Handling Costs
Significant Accounting Policies [Line Items]
Shipping and handling costs	$ 512.8	$ 347.7	$ 332.5
Customer Concentration Risk \| Sales Revenue, Net
Significant Accounting Policies [Line Items]
Number of top sales customers \| Customer	10
Maximum net sale to single customer, percentage	5.00%
Customer Concentration Risk \| Sales Revenue, Net \| Top Ten Customers
Significant Accounting Policies [Line Items]
Percentage of net revenue from major customers	18.00%
Supplier Concentration Risk \| Cost of Goods Sold
Significant Accounting Policies [Line Items]
Purchases from largest single supplier, percentage	7.00%
Minimum \| Lease Agreements
Significant Accounting Policies [Line Items]
Total lease term	5 years
Renewal term	1 year
Minimum \| Buildings and Improvements
Significant Accounting Policies [Line Items]
Estimated useful lives	10 years
Minimum \| Machinery and Equipment
Significant Accounting Policies [Line Items]
Estimated useful lives	7 years
Minimum \| Furniture, Fixtures and Information Technology
Significant Accounting Policies [Line Items]
Estimated useful lives	3 years
Maximum \| Lease Agreements
Significant Accounting Policies [Line Items]
Total lease term	15 years
Renewal term	5 years
Maximum \| Buildings and Improvements
Significant Accounting Policies [Line Items]
Estimated useful lives	40 years
Maximum \| Machinery and Equipment
Significant Accounting Policies [Line Items]
Estimated useful lives	10 years
Maximum \| Furniture, Fixtures and Information Technology
Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Transferred over Time \| Maximum
Significant Accounting Policies [Line Items]
Percentage of revenue from installation and construction services	10.00%