Summary of Significant Accounting Policies- Vendor Rebates and Allowances (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Accounting Policies [Abstract]
Vendor rebates and allowances	$ 13.7	$ 17.4

Rebates and allowances receivable from the vendor as of the balance sheet date.

No definition available.

Name:	bcc_VendorRebatesAndAllowances
Namespace Prefix:	bcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant