XML 28 R43.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified | Sep. 28, 2013 | Dec. 29, 2012
--- | --- | ---
Fair Value Measurements [Abstract] |  |
Mortgage discounted carrying value | $ 198.4 | $ 206.0
Mortgage fair value | $ 198.0 | $ 205.5

X
- Definition Mortgage loan discounted carrying value disclosure. + References No definition available. + Details
Name: | bxc_MortgageLoanDiscountedCarryingValueDisclosure
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration