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Summary of Significant Accounting Policies Summary of Significant Accounting Policies:Vendor Rebates and Allowances (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Vendor Rebates and Allowances	$ 12.3	$ 9.9

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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