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Commitments and Contingencies (Detail Textuals)	Sep. 29, 2012
Commitments and Contingencies [Abstract]
Percentage of total work force covered under collective bargaining agreements	32.00%
Percentage of work force expired	11.00%

X

- Definition

Percentage of employee labor contracts that expire within the next year.

+ References

No definition available.

+ Details

Name:	bxc_PercentageOfEmployeeLaborContractsThatExpire
Namespace Prefix:	bxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of employees represented by various labor unions.

+ References

No definition available.

+ Details

Name:	bxc_PercentageOfEmployeesRepresentedByVariousLaborUnions
Namespace Prefix:	bxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration