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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