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Commitments and Contingencies (Details) - employee	Sep. 29, 2018	Apr. 13, 2018
Subsequent Event [Line Items]
Entity number of employees	2,500
Percentage of employees represented by various labor unions	20.00%
Percentage Of Employees Covered By CBAs, Or Expired And Under Negotiation	5.00%
Cedar Creek
Subsequent Event [Line Items]
Entity number of employees		1,100

X

- Definition

Percentage Of Employees Covered By CBAs, Or Expired And Under Negotiation

+ References

No definition available.

+ Details

Name:	bxc_PercentageOfEmployeesCoveredByCBAsOrExpiredAndUnderNegotiation
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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bxc_CedarCreekMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: