Document And Entity Information - shares	9 Months Ended
	Aug. 02, 2015	Aug. 31, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	NCI BUILDING SYSTEMS INC
Entity Central Index Key	0000883902
Trading Symbol	NCS
Current Fiscal Year End Date	--11-01
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Aug. 02, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		74,082,045