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v3.22.1

Leases - Narrative (Details) | 3 Months Ended
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Apr. 02, 2022 option
Lessee, Lease, Description [Line Items] |
Number of Options | 1
Lease renewal term | 5 years
Minimum |
Lessee, Lease, Description [Line Items] |
Lease term | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Lease term | 15 years

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- Definition Lessee, Leases, Number Of Options To Extend + References No definition available. + Details
Name: | bxc_LesseeLeasesNumberOfOptionsToExtend
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee, Leases, Renewal Term + References No definition available. + Details
Name: | bxc_LesseeLeasesRenewalTerm
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Leases, Term Of Contract + References No definition available. + Details
Name: | bxc_LesseeLeasesTermOfContract
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |