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Subsequent Events (Details) (Subsequent Event, Hourly Pension Plan, USD $) In Millions, unless otherwise specified | 3 Months Ended
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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