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Mortgage (Detail Textuals) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Jan. 31, 2012	Sep. 29, 2012
Debt Instrument [Line Items]
Restricted cash used to reduce the mortgage principal	$ 6.5	$ 12.8
Mortgage
Debt Instrument [Line Items]
Restricted cash, based on the most recent amendment to the mortgage		11.8
Incremental tranche payment of restricted cash		$ 10

X

- Definition

This element represents the amount of restricted cash used to reduce mortgage amended.

+ References

No definition available.

+ Details

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

X

- Definition

Restricted cash used to reduce mortgage principal.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the incremental payment of restricted cash that will accumulate during the period.

+ References

No definition available.

+ Details

Name:	bxc_TranchePaymentOfRestrictedCash
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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