Document And Entity Information	6 Months Ended
	May 03, 2015	Jun. 01, 2015
Document Information [Line Items]
Entity Registrant Name	NCI BUILDING SYSTEMS INC
Entity Central Index Key	0000883902
Current Fiscal Year End Date	--11-01
Entity Filer Category	Accelerated Filer
Trading Symbol	NCS
Entity Common Stock, Shares Outstanding		73,807,877
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 03, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2