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Subsequent Events (Details) (Subsequent Event, Cerberus, USD $) In Millions, unless otherwise specified | 0 Months Ended
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Jan. 10, 2013
Subsequent Event | Cerberus |
Subsequent Event [Line Items] |
Offering of common stock to stockholders via the rights offering | $ 40
Approximate gross proceeds from fully subscribed rights offering of common stock | $ 40

X
- Definition Gross proceeds from rights offering. + References No definition available. + Details
Name: | bxc_GrossProceedsFromRightsOffering
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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