Basis of Presentation	9 Months Ended
Jul. 31, 2011
Basis of Presentation [Abstract]
BASIS OF PRESENTATION	NOTE 1 — BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements for NCI Building Systems, Inc. and its subsidiaries (the “Company,” “we,” “us,” and “our”) have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, the unaudited consolidated financial statements included herein contain all adjustments necessary to fairly present our financial position, results of operations and cash flows for the periods indicated. Such adjustments, other than nonrecurring adjustments that have been separately disclosed, are of a normal, recurring nature. Operating results for the fiscal three and nine month periods ended July 31, 2011 are not necessarily indicative of the results that may be expected for the fiscal year ending October 30, 2011. Our sales and earnings are subject to both seasonal and cyclical trends and are influenced by general economic conditions, interest rates, the price of steel relative to other building materials, the level of nonresidential construction activity, roof repair and retrofit demand and the availability and cost of financing for construction projects. We use a four-four-five week calendar each quarter with our year end on the Sunday closest to October 31. The year end for fiscal 2011 is October 30, 2011. Certain reclassifications have been made to prior period amounts in our Consolidated Balance Sheets and Consolidated Statements of Operations to conform to the current presentation. These reclassifications include the reclassification of shares of our common stock, par value $0.01 (the “Common Stock”), to redeemable common stock. See Note 11 — Redeemable Common Stock. The net effect of these reclassifications was not material to our consolidated financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in our Annual Report on Form 10-K for the fiscal year ended October 31, 2010 filed with the Securities and Exchange Commission (the “SEC”) on December 22, 2010.

NOTE 1 — BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements for NCI Building Systems, Inc. and its subsidiaries (the “Company,” “we,” “us,” and “our”) have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, the unaudited consolidated financial statements included herein contain all adjustments necessary to fairly present our financial position, results of operations and cash flows for the periods indicated. Such adjustments, other than nonrecurring adjustments that have been separately disclosed, are of a normal, recurring nature. Operating results for the fiscal three and nine month periods ended July 31, 2011 are not necessarily indicative of the results that may be expected for the fiscal year ending October 30, 2011. Our sales and earnings are subject to both seasonal and cyclical trends and are influenced by general economic conditions, interest rates, the price of steel relative to other building materials, the level of nonresidential construction activity, roof repair and retrofit demand and the availability and cost of financing for construction projects.

We use a four-four-five week calendar each quarter with our year end on the Sunday closest to October 31. The year end for fiscal 2011 is October 30, 2011.

Certain reclassifications have been made to prior period amounts in our Consolidated Balance Sheets and Consolidated Statements of Operations to conform to the current presentation. These reclassifications include the reclassification of shares of our common stock, par value $0.01 (the “Common Stock”), to redeemable common stock. See Note 11 — Redeemable Common Stock. The net effect of these reclassifications was not material to our consolidated financial statements.

For further information, refer to the consolidated financial statements and footnotes thereto included in our Annual Report on Form 10-K for the fiscal year ended October 31, 2010 filed with the Securities and Exchange Commission (the “SEC”) on December 22, 2010.