NATURE OF BUSINESS AND BASIS OF PRESENTATION	12 Months Ended
Oct. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
NATURE OF BUSINESS AND BASIS OF PRESENTATION	NATURE OF BUSINESS AND BASIS OF PRESENTATION Nature of Business NCI Building Systems, Inc. (together with its subsidiaries, unless otherwise indicated, the “Company,” “we,” “us” or “our”) is one of North America’s largest integrated manufacturers and marketers of metal products for the nonresidential construction industry. We provide metal coil coating services and design, engineer, manufacture and market metal components and engineered building systems primarily used in nonresidential construction. We manufacture and distribute extensive lines of metal products for the nonresidential construction market under multiple brand names through a broad network of manufacturing facilities and distribution centers. We sell our products primarily for use in new construction activities and also in repair and retrofit activities, mostly in North America. We have four operating segments: Engineered Building Systems, Metal Components, Insulated Metal Panels and Metal Coil Coating. Operating segments are defined as components of an enterprise that engage in business activities and for which discrete financial information is available that is evaluated on a regular basis by the chief operating decision maker to make decisions about how to allocate resources to the segment and assess the performance of the segment. We market the products in each of our operating segments nationwide primarily through a direct sales force and, in the case of our Engineered Building Systems segment, through authorized builder networks. Basis of Presentation Our consolidated financial statements include the accounts of the Company and all majority-owned subsidiaries. All intercompany accounts, transactions and profits arising from consolidated entities have been eliminated in consolidation. Fiscal Year We use a 52/53 week fiscal year ending on the Sunday closest to October 31. The year end for fiscal 2018 is October 28, 2018. Fiscal years 2018, 2017, and 2016 were 52-week fiscal years. On November 16, 2018, the board of directors of the Company approved a change to the Company’s fiscal year from a 52/53 week year with the Company’s fiscal year end on the Sunday closest to October 31 to a fiscal year of the 12 month period of January 1 to December 31 of each calendar year, to commence with the fiscal year ending December 31, 2019. The Company will file a transition report on Form 10-Q on or before February 11, 2019 that will cover the transition period from October 29, 2018 to December 31, 2018.

NATURE OF BUSINESS AND BASIS OF PRESENTATION

Nature of Business

NCI Building Systems, Inc. (together with its subsidiaries, unless otherwise indicated, the “Company,” “we,” “us” or “our”) is one of North America’s largest integrated manufacturers and marketers of metal products for the nonresidential construction industry. We provide metal coil coating services and design, engineer, manufacture and market metal components and engineered building systems primarily used in nonresidential construction. We manufacture and distribute extensive lines of metal products for the nonresidential construction market under multiple brand names through a broad network of manufacturing facilities and distribution centers. We sell our products primarily for use in new construction activities and also in repair and retrofit activities, mostly in North America.

We have four operating segments: Engineered Building Systems, Metal Components, Insulated Metal Panels and Metal Coil Coating. Operating segments are defined as components of an enterprise that engage in business activities and for which discrete financial information is available that is evaluated on a regular basis by the chief operating decision maker to make decisions about how to allocate resources to the segment and assess the performance of the segment. We market the products in each of our operating segments nationwide primarily through a direct sales force and, in the case of our Engineered Building Systems segment, through authorized builder networks.

Basis of Presentation

Our consolidated financial statements include the accounts of the Company and all majority-owned subsidiaries. All intercompany accounts, transactions and profits arising from consolidated entities have been eliminated in consolidation.

Fiscal Year

We use a 52/53 week fiscal year ending on the Sunday closest to October 31. The year end for fiscal 2018 is October 28, 2018. Fiscal years 2018, 2017, and 2016 were 52-week fiscal years.

On November 16, 2018, the board of directors of the Company approved a change to the Company’s fiscal year from a 52/53 week year with the Company’s fiscal year end on the Sunday closest to October 31 to a fiscal year of the 12 month period of January 1 to December 31 of each calendar year, to commence with the fiscal year ending December 31, 2019. The Company will file a transition report on Form 10-Q on or before February 11, 2019 that will cover the transition period from October 29, 2018 to December 31, 2018.