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v2.4.1.9

Subsequent Events Subsequent Event (Details) (Subsequent Event, USD $) | 0 Months Ended |
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Feb. 18, 2015 | Feb. 18, 2015
Revolving credit facility |  |
Subsequent Event [Line Items] |  |
Fixed charge coverage ratio | 1.2 bxc_LineofCreditFacilityCovenantRestrictionCoverageRatioFixedAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 1.2 bxc_LineofCreditFacilityCovenantRestrictionCoverageRatioFixedAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Tranche A Loan |  |
Subsequent Event [Line Items] |  |
Decrease to borrowing capacity of revolving credit facility per month | $ 2,000,000.0 bxc_LineofCreditFacilityDecreasetoBorrowingCapacityUnderAmendedCreditAgreementAmountPerMonth / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Periodic increase in interest rate, starting April 1, 2015 | 25.00%bxc_LineofCreditFacilityQuarterlyIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 25.00%bxc_LineofCreditFacilityQuarterlyIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Maximum increase in interest rate | 100.00%bxc_LineofCreditFacilityMaximumIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 100.00%bxc_LineofCreditFacilityMaximumIncreaseinInterestRatePercent / us-gaap_CreditFacilityAxis = bxc_TrancheALoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Minimum | Revolving credit facility |  |
Subsequent Event [Line Items] |  |
Credit facility, required repayment amount by May 1, 2016 | 35,000,000 bxc_LineofCreditFacilityRequiredRepaymentAmountPeriodOne / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 35,000,000 bxc_LineofCreditFacilityRequiredRepaymentAmountPeriodOne / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Unused borrowing capacity threshold of revolving credit facility to terminate contractual monthly capacity decrease | $ 50,000,000.0 bxc_LineofCreditFacilityDecreasetoBorrowingCapacityUnusedBorrowingCapacityThresholdtoTerminateContractualCapacityDecreaseUnderAmendedCreditAgreement / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 50,000,000.0 bxc_LineofCreditFacilityDecreasetoBorrowingCapacityUnusedBorrowingCapacityThresholdtoTerminateContractualCapacityDecreaseUnderAmendedCreditAgreement / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |