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Inventory Reserve Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 04, 2014 | Dec. 29, 2012 | Dec. 31, 2011
Inventory Reserve Accounts [Abstract] |  |  |
Obsolescence/damaged inventory reserve, Beginning balance | $ 1,126 | $ 1,492 | $ 1,670
Obsolescence damaged inventory reserve, Expense | 4,783 | 3,625 | 2,309
Obsolescence/damaged inventory reserve, Write-offs and Other, net | (4,111) | (3,991) | (2,487)
Obsolescence/damaged inventory reserve, Ending balance | 1,798 | 1,126 | 1,492
Lower of cost or market reserve, Beginning balance |  |  |
Lower of cost or market reserve, Expense | 3,843 |  |
Lower of cost or market reserve, Write-offs and Other, net | (3,843) |  |
Lower of cost or market reserve, Ending balance |  |  |

X
- Definition Represents the carrying value as of the balance sheet date of inventory lower of cost or market reserve. + References No definition available. + Details
Name: | bxc_InventoryLowerOfCostOrMarketReserve
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents change in the inventory reserve representing the cumulative difference between the cost of the inventory and the market value, which change has been reflected in the statement of income during the period. + References No definition available. + Details
Name: | bxc_InventoryLowerOfCostOrMarketReservePeriodCharge
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents expense in a given period to inventory valuation reserves. + References No definition available. + Details
Name: | bxc_InventoryValuationReservesExpense
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the total of the deductions in a given period to inventory valuation reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value). + References No definition available. + Details
Name: | bxc_InventoryValuationReservesWriteOffAndOtherAdjustments
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the total of the deductions in a given period to lower of cost or market reserve. + References No definition available. + Details
Name: | bxc_LowerOfCostOrMarketReserveWriteOffAndOtherAdjustments
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of valuation reserve for inventory. + 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 210.5-02.6(a)) -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 6 -Subparagraph a -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
Name: | us-gaap_InventoryValuationReserves
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant