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Commitments and Contingencies (Details)	Dec. 30, 2017 employee
Commitments and Contingencies Disclosure [Abstract]
Number of persons employed on full-time basis	1,500
Percentages of employees represented by various labor unions	34.00%
Percentage of collective bargaining agreements up for renewal in 2016	11.00%

X

- Definition

Represents number of collective bargaining agreements up for renewal in One Year

+ References

No definition available.

+ Details

Name:	bxc_NumberOfCollectiveBargainingAgreementsUpForRenewalinOneYear
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

- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

Name:	dei_EntityNumberOfEmployees
Namespace Prefix:	dei_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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