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Summary of Significant Accounting Policies- Vendor Rebates and Allowances (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Accounting Policies [Abstract] |  |
Vendor rebates and allowances | $ 13.1 | $ 17.7

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- Definition Rebates and allowances receivable from the vendor as of the balance sheet date. + References No definition available. + Details
Name: | bcc_VendorRebatesAndAllowances
Namespace Prefix: | bcc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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