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Mortgage (Detail Textuals) (USD $)			1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 28, 2013	Dec. 29, 2012	Sep. 19, 2012 Mortgage	Sep. 28, 2013 Mortgage	Sep. 29, 2012 Mortgage	Mar. 31, 2012 Mortgage	Sep. 28, 2013 Mortgage Facility
Debt Instrument [Line Items]
Mortgage loan with German American Capital Corporation				$ 295,000,000			$ 295,000,000
Mortgage loan term							10 years
Mortgage loan balance	198,427,000	206,000,000
Distribution facilities							51
Mortgage interest rate				6.35%			6.35%
Payment of indebtedness under the mortgage			11,800,000
Collateral to be remitted to mortgage company after amendment of mortgage			10,000,000
Collateral to be remitted to borrower after amendment of mortgage			10,000,000
Funds transferred as collateral in next twelve months			13,300,000
Funds transferred as collateral for mortgage loans remitted for use			10,000,000
Debt fees capitalized and amortized over the remaining term of the mortgage			300,000
Increase in restricted cash				8,400,000	12,800,000	300,000
Restricted cash used to reduce the mortgage principal							$ 9,000,000

X

- Definition

Represents collateral to be remitted to mortgage company after amendment of mortgage.

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents collateral to be remitted to borrower after amendment of mortgage.

+ References

No definition available.

+ Details

Name:	bxc_CashRemainingInCollateralAccount
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the funds expected to be transferred as collateral for mortgage loans over the next 12 months.

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the funds transferred as collateral for mortgage loans remitted for use as indicated in the amendment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Initial amount of borrowings under the mortgage when the mortgage was initially executed prior to deducting any payments of principal.

+ References

No definition available.

+ Details

Name:	bxc_MortgageLoanCarryingAmount
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Mortgage loan secured by number of distribution facilities

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Mortgage loan term period.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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- Definition

Prepayments of indebtedness under the mortgage.

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Restricted cash used to reduce mortgage principal.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Definition

Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

+ References

No definition available.

+ Details

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