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Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified	Jan. 04, 2014	Dec. 29, 2012
Discounted carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Value of mortgage	$ 186.9	$ 206.0
Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Value of mortgage	$ 186.6	$ 205.5

X

- Definition

Represents mortgage loan fair value disclosure.

+ References

No definition available.

+ Details

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

X

- Details

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