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Commitments and Contingencies (Details)	Sep. 28, 2019 employee
Other Commitments [Line Items]
Percentage of employees represented by various labor unions	20.00%
Percentage of employees covered by CBAs	1.00%
Minimum
Other Commitments [Line Items]
Entity number of employees	2,200

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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: