Line of credit accordion credit facility.

No definition available.

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

- Definition

Line of Credit Facility, Decrease to Borrowing Capacity, Under Amended Credit Agreement, Amount Per Month

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Decrease to Borrowing Capacity, Unused Borrowing Capacity Threshold to Terminate Contractual Capacity Decrease, Under Amended Credit Agreement

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Revolving Credit Converted to Term Loan, Pursuant to Credit Agreement

+ References

No definition available.

+ Details

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

- Definition

Represents outstanding letters of credit securing certain obligations, as of the balance sheet date.

+ References

No definition available.

+ Details

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

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

Revolving Credit Facilities (Detail Textuals) (U.S., Wells Fargo Bank, USD $)	0 Months Ended
	Aug. 14, 2014	Aug. 04, 2006	Oct. 04, 2014	Jan. 04, 2014	Aug. 04, 2006
Revolving credit facility
Line of Credit Facility [Line Items]
Date of the final maturity of revolving credit facility		Apr. 15, 2016
Maximum borrowing capacity without the accordion feature					$ 467,500,000.0
Line of credit uncommitted accordion credit facility		75,000,000.0
Revolving credit facility maximum available credit less the uncommitted accordion feature plus the additional loan commitment					542,500,000.0
Monthly decrease to the borrowing capacity, under amended credit agreement	2,000,000.0
Outstanding lines of credit			273,600,000
Revolving credit facility excess availability			86,100,000
Interest rate on revolving credit facility			3.80%
Outstanding letters of credit				3,600,000
Revolving credit facility \| Minimum
Line of Credit Facility [Line Items]
Excess availability under the credit facility to terminate contractual decrease to the borrowing capacity	50,000,000.0
Tranche A Loan
Line of Credit Facility [Line Items]
Loan amount of the credit facility		$ 20,000,000			$ 20,000,000