Document And Entity Information - shares	9 Months Ended
	Jul. 30, 2017	Aug. 31, 2017
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	--10-29
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jul. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		70,919,195