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Employee Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Jan. 04, 2014	Dec. 29, 2012
Net periodic pension cost
Service cost	$ 1,056us-gaap_DefinedBenefitPlanServiceCost	$ 2,193us-gaap_DefinedBenefitPlanServiceCost	$ 1,878us-gaap_DefinedBenefitPlanServiceCost
Interest cost on projected benefit obligation	5,123us-gaap_DefinedBenefitPlanInterestCost	4,750us-gaap_DefinedBenefitPlanInterestCost	4,885us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets	(6,041)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets	(5,225)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets	(4,897)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of unrecognized loss	763bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses	2,873bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses	2,077bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses
Net periodic pension cost	$ 901us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost	$ 4,591us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost	$ 3,943us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost

X

- Definition

Represents amortization of unrecognized gains losses.

+ References

No definition available.

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X

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512136



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Glossary Expected Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512171



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(3)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ 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 (h)(2)

-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

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-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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X

- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ 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 (h)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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X

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ 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 (h)(1)

-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

-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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