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Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified	Jan. 03, 2015
Discounted carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Value of mortgage	$ 177.7bxc_MortgageLoanFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Value of mortgage	$ 183.0bxc_MortgageLoanFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition

Represents mortgage loan fair value disclosure.

+ References

No definition available.

+ Details

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

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- Details

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Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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Balance Type:
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