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Employee Benefits (Details 1) (USD $) In Thousands, unless otherwise specified | Jan. 03, 2015 | Jan. 04, 2014
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Compensation and Retirement Disclosure [Abstract] |  |
Unfunded status | $ 41,763 bxc_DefinedBenefitPlanUnfundedStatusOfPlan | $ 27,885 bxc_DefinedBenefitPlanUnfundedStatusOfPlan
Unrecognized prior service cost | 1 bxc_DefinedBenefitPlanUnrecognizedPriorServiceCost | 1 bxc_DefinedBenefitPlanUnrecognizedPriorServiceCost
Unrecognized actuarial loss | 32,309 bxc_DefinedBenefitPlanUnrecognizedActuarialLoss | 14,656 bxc_DefinedBenefitPlanUnrecognizedActuarialLoss
Net amount recognized | (9,453)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet | (13,228)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Amounts recognized on the balance sheet consist of: |  |
Accumulated other comprehensive loss (pre-tax) | 32,310 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax | 14,657 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Net amount recognized | $ (9,453)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet | $ (13,228)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet

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- Definition Represents the unfunded status which is measured as the difference between the fair value of plan assets and the benefit obligation. The unfunded plans may include foreign pension plans, which may not be funded because there are no tax advantages to funding plans in those jurisdictions, and may also include other postretirement benefit plans. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount for unrecognized actuarial loss in the balance sheet. + References No definition available. + Details
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- Definition Represents the amount for unrecognized prior service cost in the balance sheet. + References No definition available. + Details
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- Details
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- Definition The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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Period Type: | instant

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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Details
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