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Commitments and Contingencies (Details) - employee	Apr. 13, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Entity number of employees		1,500
Percentage of employees represented by various labor unions		34.00%
Number of collective bargaining agreements up for renewal in one year		11.00%
Cedar Creek | Subsequent Event
Subsequent Event [Line Items]
Entity number of employees	2,600
Number of unionized employees	0

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
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X

- Definition

Number of Unionized Employees

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- 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
Period Type:	instant

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

- 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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
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