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Subsequent Events (Details) (Subsequent Event, Hourly Pension Plan, USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013
Subsequent Event | Hourly Pension Plan
Subsequent Event [Line Items]
Independent appraisals cost of land and buildings located in Charleston, S.C. and Buffalo, N.Y.	$ 6.8
Lease back period for real property	20 years

X

- Definition

Represents the lease back period for real property.

+ References

No definition available.

+ Details

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

X

- Definition

Represents real property valued by independent appraisals.

+ References

No definition available.

+ Details

Name:	bxc_RealPropertyValuedByIndependentAppraisals
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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