XML 78 R65.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Related Party Transactions (Details) $ in Millions | Oct. 23, 2017 USD ($)
--- | ---
Related Party Transactions [Abstract] |
Percentage of shares sold in second offering | 97.00%
Expenses incurred in connection with second offering | $ 0.3

X
- Definition Related Party Transaction, Shares Sold by Majority Shareholder, Percent + References No definition available. + Details
Name: | bxc_RelatedPartyTransactionSharesSoldbyMajorityShareholderPercent
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration