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

X

- Details

Name:	bxc_MortgageOutstandingPrincipalBalanceAbstract
Namespace Prefix:	bxc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- 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

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- 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