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Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2026 | Jul. 04, 2026 | Jun. 28, 2025
Inventory Disclosure [Abstract] |  |  |
Inventory adjustments, refund |  |  | $ 2.4
Inventory adjustments, refund, interest |  |  | $ 0.5
Inventory adjustments | $ 0.0 | $ 0.0 |

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- Definition Inventory Adjustments During Period + References No definition available. + Details
Name: | bxc_InventoryAdjustmentsDuringPeriod
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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

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