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Mortgage (Details) (USD $) In Thousands, unless otherwise specified | Jan. 03, 2015
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Mortgage outstanding principal balance |
2015 | $ 2,678 bxc_MortgageRepaymentsOfPrincipalInYearOne
2016 | 175,044 bxc_MortgageRepaymentsOfPrincipalInYearTwo
Total | $ 177,722 bxc_MortgageRepaymentsOfPrincipal

X
- Details
Name: | bxc_MortgageOutstandingPrincipalBalanceAbstract
Namespace Prefix: | bxc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the total amount of mortgage repayments of principal. + References No definition available. + Details
Name: | bxc_MortgageRepaymentsOfPrincipal
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents portion of the mortgage balance redeemable at fixed or determinable prices and dates maturing in the first year following the current fiscal year. + References No definition available. + Details
Name: | bxc_MortgageRepaymentsOfPrincipalInYearOne
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents portion of the mortgage balance redeemable at fixed or determinable prices and dates maturing in second fiscal year following the current fiscal year. + References No definition available. + Details
Name: | bxc_MortgageRepaymentsOfPrincipalInYearTwo
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant