XML 69 R54.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Employee Benefits - Multiemployer Pension Plans (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($) | Jan. 03, 2015 USD ($)
Multiemployer Plans [Line Items] |  |  |
Multiemployer contributions for the period | $ 1,400,000 | $ 2,300,000 | $ 1,000,000
Lumber Employees Local 786 Retirement Fund (1) |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN/Pension Plan Number | 516067407 |  |
Pension Act Zone Status | Green |  |
Certified Zone Status, Date | Aug. 31, 2015 |  |
FIP/RP Status | NA |  |
Multiemployer contributions for the period | $ 400,000 | 400,000 | 400,000
Employer contribution plans, employer contribution amount in excess of plan contributions | $ 0.05 |  |
Central States, Southeast and Southwest Areas Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN/Pension Plan Number | 366044243 |  |
Multiemployer contributions for the period | $ 600,000 | 700,000 | 600,000
Multiemployer plans, employer contribution amount as a percentage of plan contributions | 0.05 |  |
Multiemployer plans, withdrawal liability | $ 30,700,000 |  |
Other |  |  |
Multiemployer Plans [Line Items] |  |  |
Multiemployer contributions for the period | $ 400,000 | $ 1,200,000 | $ 0

X
- Definition Multiemployer Plans, Employer Contribution Amount as a Percentage of Plan Contributions + References No definition available. + Details
Name: | bxc_MultiemployerPlansEmployerContributionAmountasaPercentageofPlanContributions
Namespace Prefix: | bxc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Multiemployer Plans, Employer Contribution Amount in Excess of Plan Contributions + References No definition available. + Details
Name: | bxc_MultiemployerPlansEmployerContributionAmountinExcessofPlanContributions
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Multiemployer Plans, Withdrawal Liability + References No definition available. + Details
Name: | bxc_MultiemployerPlansWithdrawalLiability
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details
Name: | dei_EntityTaxIdentificationNumber
Namespace Prefix: | dei_
Data Type: | dei:nineDigitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlanPeriodContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlansCertifiedZoneStatus
Namespace Prefix: | us-gaap_
Data Type: | us-types:zoneStatusItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date of the multiemployer plan's year end to which the certified zone status relates, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlansCertifiedZoneStatusDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlansFundingImprovementPlanAndRehabilitationPlan
Namespace Prefix: | us-gaap_
Data Type: | us-types:fundingImprovementAndRehabilitationPlanItemType
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_MultiemployerPlansLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MultiemployerPlanNameAxis=bxc_LumberEmployeesLocal786RetirementFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MultiemployerPlanNameAxis=bxc_CentralStatesSoutheastandSouthwestAreasPensionFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MultiemployerPlanNameAxis=bxc_OtherMultiemployerPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |