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Related Party Transactions (Details) (Agreement, Cerberus, USD $) In Millions, unless otherwise specified | Dec. 29, 2012
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Agreement | Cerberus |
Related Party Transaction [Line Items] |
Amount of common stock offered under rights offering | $ 40

X
- Definition Represents the amount of common stock offered under rights offering. + References No definition available. + Details
Name: | bxc_AmountOfCommonStockOfferedUnderRightsOffering
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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