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Lease Commitments Lease Commitments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Jan. 04, 2014	Dec. 29, 2012
Capital Leased Assets [Line Items]
Total rent expense	$ 4.5us-gaap_LeaseAndRentalExpense	$ 4.8us-gaap_LeaseAndRentalExpense	$ 4.8us-gaap_LeaseAndRentalExpense
Basis of assets under capital leases	16.4bxc_CarryingAmountOfCapitalLeases	15.4bxc_CarryingAmountOfCapitalLeases
Net book value of assets under capital leases	$ 9.0bxc_NetBookValueOfCapitalLeases	$ 11.1bxc_NetBookValueOfCapitalLeases
Minimum
Capital Leased Assets [Line Items]
Capital lease maturity		5 years
Capital lease interest rate	4.00%bxc_CapitalLeasesInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Capital Leased Assets [Line Items]
Capital lease maturity		7 years
Capital lease interest rate	7.60%bxc_CapitalLeasesInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Capital Leases, Interest Rate

+ References

No definition available.

+ Details

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

X

- Definition

Represents maturity period of capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesMaturityPeriod
Namespace Prefix:	bxc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents carrying amount of capital leases related to trucks and trailors.

+ References

No definition available.

+ Details

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

X

- Definition

Represents net book value of capital leases related to trucks and trailors.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: