XML 50 R1.htm IDEA: XBRL DOCUMENT v2.4.1.9
Document and Entity Information
6 Months Ended
Apr. 30, 2015
May 29, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name Quanex Building Products Corporation  
Trading Symbol NX  
Entity Central Index Key 0001423221  
Current Fiscal Year End Date --10-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Apr. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   33,871,310dei_EntityCommonStockSharesOutstanding