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v3.25.3

Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2025 | Sep. 28, 2024 | Sep. 27, 2025 | Sep. 28, 2024
Inventory Disclosure [Abstract] |  |  |  |
Inventory adjustments, refund | $ (2.2) | $ 3.8 | $ 0.2 | $ 20.7
Inventory adjustments, refund, interest |  | $ 0.7 | $ 0.5 | $ 2.7

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- 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