XML 47 R32.htm IDEA: XBRL DOCUMENT v3.7.0.1

Employee Stock-Based Compensation - Restricted Stock Unit Valuation (Detail) - Market and Service Condition Based Restricted Stock Unit Grants	6 Months Ended
	Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility (company)	73.70%
Expected volatility (peer group median)	33.80%
Correlation between the company and peer group median	0.33
Expected dividend yield	0.00%
Risk-free rate	1.50%

X

- Definition

The correlation coefficient between the company and the peer group median.

+ References

No definition available.

+ Details

Name:	bldr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCorrelationRate
Namespace Prefix:	bldr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The estimated measure of the percentage by which the share prices of the constituents of the peer group is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

Name:	bldr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeerGroupMedian
Namespace Prefix:	bldr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) over the vesting period.

+ References

No definition available.

+ Details

Name:	bldr_ShareBasedCompensationArrangementRestrictedStockUnitAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix:	bldr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The risk-free interest rate assumption that is used in valuing restricted stock units.

+ References

No definition available.

+ Details

Name:	bldr_ShareBasedCompensationArrangementRestrictedStockUnitAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	bldr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_AwardTypeAxis=bldr_MarketAndServiceConditionBasedRestrictedStockUnitGrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: