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Revolving Credit Facilities (Detail Textuals 1) (Revolving credit facility, USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 05, 2014	Jan. 04, 2014
U.S. | Wells Fargo Bank
Line of Credit Facility [Line Items]
Minimum amount of excess availability required to avoid lender dominion of our accounts	$ 38.7
Minimum amount of excess availability required to avoid lender dominion of our accounts as a percentage of the revolving credit facility balance	15.00%
Outstanding lines of credit	258.4	207.9
Revolving credit facility excess availability	87.7	44.5
Interest rate on revolving credit facility	3.80%	3.70%
Bluelinx Building Products Canada Ltd | Canada | CIBC Asset Based Lending Inc
Line of Credit Facility [Line Items]
Outstanding lines of credit	2.8	3.3
Revolving credit facility excess availability	1.6	1.3
Interest rate on revolving credit facility	4.00%	4.00%
Canadian minimum adjusted tangible net worth covenant	$ 3.9
Canadian capital expenditures maximum percentage limit covenant	120.00%

X

- Definition

Represents canadian capital expenditure maximum percentage limit required by the lender.

+ References

No definition available.

+ Details

Name:	bxc_MaximumPercentageOfCapitalExpenses
Namespace Prefix:	bxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents minimum amount of excess availability required to avoid lender dominion of our accounts.

+ References

No definition available.

+ Details

Name:	bxc_MinimumAmountOfExcessAvailabilityRequiredToAvoidLenderDominionOfOurAccounts
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents minimum amount of excess availability required to avoid lender dominion of our accounts as a percentage of the revolving credit facility balance.

+ References

No definition available.

+ Details

Name:	bxc_MinimumAmountOfExcessAvailabilityRequiredToAvoidLenderDominionOfOurAccountsAsPercentageOfRevolvingCreditFacilityBalance
Namespace Prefix:	bxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents lowest amount of net worth (total assets minus total liabilities) required by lender.

+ References

No definition available.

+ Details

Name:	bxc_MinimumNetWorthRequiredForLenderCompliance
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The effective interest rate at the end of the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant