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Subsequent Events (Details) - Subsequent event - Line of credit - Amended Revolving Credit Facility	Aug. 02, 2021
Subsequent Event [Line Items]
Decrease in variable rate	0.50%
LIBOR | Minimum
Subsequent Event [Line Items]
Variable rate	1.25%
LIBOR | Maximum
Subsequent Event [Line Items]
Variable rate	1.75%
Base Rate | Minimum
Subsequent Event [Line Items]
Variable rate	0.25%
Base Rate | Maximum
Subsequent Event [Line Items]
Variable rate	0.75%

X

- Definition

Debt Instrument, Increase (Decrease) Basis Spread On Variable Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Details

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

X

- Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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