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Commitments and Contingencies (Details)	9 Months Ended
	Sep. 26, 2020 employee Agreement
Commitments and Contingencies Disclosure [Abstract]
Entity number of employees | employee	2,000
Percentage of employees represented by various labor unions	22.00%
Percentage of employees covered by CBAs	1.00%
Number of CBAs up for renewal, next fiscal year agreement	3
Number of CBAs renewed	1
Number of CBAs to be renegotiated	2

X

- Definition

Number Of Collective Bargaining Agreements, Number Of Renewals

+ References

No definition available.

+ Details

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X

- Definition

Number Of Collective Bargaining Agreements, Renewals In Next Fiscal Year

+ References

No definition available.

+ Details

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X

- Definition

Number Of Collective Bargaining Agreements, Renewals To Be Renegotiated

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
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Balance Type:	na
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- Definition

Percentage of employees represented by various labor unions.

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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