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Summary of Significant Accounting Policies- Vendor Rebates and Allowances (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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