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v3.24.1.u1

Inventories (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 30, 2024 USD ($)
Inventory Disclosure [Abstract] |
Inventory refund | $ 16.9
Inventory interest refund | $ 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration