Document And Entity Information - shares	6 Months Ended
	May. 01, 2016	May. 25, 2016
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	--10-30
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	May 01, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		73,039,779