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Inventory (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Inventory Disclosure [Abstract]
Inventory adjustments, refund	$ 2.4	$ 16.9
Inventory adjustments, refund, interest	$ 0.5	$ 2.0

X

- Definition

Inventory Adjustments, Refund

+ References

No definition available.

+ Details

Name:	bxc_InventoryAdjustmentsRefund
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Inventory Adjustments, Refund, Interest

+ References

No definition available.

+ Details

Name:	bxc_InventoryAdjustmentsRefundInterest
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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