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Revolving Credit Facilities (Detail Textuals) (USD $)	0 Months Ended
	Feb. 18, 2015	Feb. 18, 2015
Revolving credit facility
Line of Credit Facility [Line Items]
Excess availability under the credit facility to terminate contractual decrease to the borrowing capacity (less than)	$ 50,000,000.0bxc_LineofCreditFacilityDecreasetoBorrowingCapacityUnusedBorrowingCapacityThresholdtoTerminateContractualCapacityDecreaseUnderAmendedCreditAgreement / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember	50,000,000.0bxc_LineofCreditFacilityDecreasetoBorrowingCapacityUnusedBorrowingCapacityThresholdtoTerminateContractualCapacityDecreaseUnderAmendedCreditAgreement / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Line of credit facility, covenant restriction, coverage ratio, fixed amount	1.2bxc_LineofCreditFacilityCovenantRestrictionCoverageRatioFixedAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember	1.2bxc_LineofCreditFacilityCovenantRestrictionCoverageRatioFixedAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Revolving credit facility | Minimum
Line of Credit Facility [Line Items]
Required repayments of lines of credit by May 1, 2016	35,000,000.0bxc_LineofCreditFacilityRequiredRepaymentAmountPeriodOne / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember	35,000,000.0bxc_LineofCreditFacilityRequiredRepaymentAmountPeriodOne / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Tranche A Loan
Line of Credit Facility [Line Items]
Monthly decrease to the borrowing capacity, under amended credit agreement	2,000,000.0bxc_LineofCreditFacilityDecreasetoBorrowingCapacityUnderAmendedCreditAgreementAmountPerMonth / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember
Line of credit facility, periodic increase in interest rate	25.00%bxc_LineofCreditFacilityQuarterlyIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember	25.00%bxc_LineofCreditFacilityQuarterlyIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember
Line of credit facility, maximum increase in interest rate	100.00%bxc_LineofCreditFacilityMaximumIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember	100.00%bxc_LineofCreditFacilityMaximumIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember
U.S. | Tranche A Loan | Wells Fargo Bank
Line of Credit Facility [Line Items]
Loan amount of the credit facility	$ 20,000,000.0bxc_LineofCreditFacilityRevolvingCreditConvertedtoTermLoanPursuanttoCreditAgreement / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember / us-gaap_LineOfCreditFacilityAxis = bxc_WellsFargoBankMember / us-gaap_StatementGeographicalAxis = country_US	20,000,000.0bxc_LineofCreditFacilityRevolvingCreditConvertedtoTermLoanPursuanttoCreditAgreement / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember / us-gaap_LineOfCreditFacilityAxis = bxc_WellsFargoBankMember / us-gaap_StatementGeographicalAxis = country_US

X

- Definition

Line of Credit Facility, Covenant Restriction, Coverage Ratio, Fixed Amount

+ References

No definition available.

+ Details

Name:	bxc_LineofCreditFacilityCovenantRestrictionCoverageRatioFixedAmount
Namespace Prefix:	bxc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- 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

X

- Definition

Line of Credit Facility, Maximum Increase in Interest Rate, Percent

+ References

No definition available.

+ Details

Name:	bxc_LineofCreditFacilityMaximumIncreaseinInterestRatePercent
Namespace Prefix:	bxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line of Credit Facility, Quarterly Increase in Interest Rate, Percent

+ References

No definition available.

+ Details

Name:	bxc_LineofCreditFacilityQuarterlyIncreaseinInterestRatePercent
Namespace Prefix:	bxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line of Credit Facility, Required Repayment Amount, Period One

+ References

No definition available.

+ Details

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

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- 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

X

- Details

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

X

- Details

Name:	us-gaap_CreditFacilityAxis=bxc_TrancheALoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: