Basis of Presentation and Significant Accounting Policies	3 Months Ended
Feb. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies Basis of Presentation. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with GAAP have been condensed or omitted. In our opinion, the accompanying unaudited consolidated financial statements contain all adjustments (consisting only of normal recurring accruals) necessary to present fairly our consolidated financial position as of February 28, 2018, the results of our consolidated operations for the three months ended February 28, 2018 and 2017, and our consolidated cash flows for the three months ended February 28, 2018 and 2017. The results of our consolidated operations for the three months ended February 28, 2018 are not necessarily indicative of the results to be expected for the full year due to seasonal variations in operating results and other factors. The consolidated balance sheet at November 30, 2017 has been taken from the audited consolidated financial statements as of that date. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the year ended November 30, 2017, which are contained in our Annual Report on Form 10-K for that period. Unless the context indicates otherwise, the terms “we,” “our,” and “us” used in this report refer to KB Home, a Delaware corporation, and its subsidiaries. Use of Estimates. The preparation of financial statements in conformity with GAAP requires management to make estimates and judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Cash and Cash Equivalents. We consider all highly liquid short-term investments purchased with an original maturity of three months or less to be cash equivalents. Our cash equivalents totaled $347.1 million at February 28, 2018 and $481.1 million at November 30, 2017. At February 28, 2018 and November 30, 2017, the majority of our cash and cash equivalents was invested in interest-bearing bank deposit accounts. Comprehensive Income (Loss). Our comprehensive loss for the three months ended February 28, 2018 was $71.3 million. For the three months ended February 28, 2017, our comprehensive income was $14.3 million. Our comprehensive income (loss) for each of the three-month periods ended February 28, 2018 and 2017 was equal to our net income (loss) for the respective periods. Recent Accounting Pronouncements Not Yet Adopted. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”). The core principle of this guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In August 2015, the FASB issued Accounting Standards Update No. 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” which delayed the effective date of ASU 2014-09 by one year. In 2016 and 2017, the FASB issued accounting standards updates that amended several aspects of ASU 2014-09. ASU 2014-09, as amended, is effective for us beginning December 1, 2018, and allows for full retrospective or modified retrospective methods of adoption. We expect to adopt ASU 2014-09 under the modified retrospective method in our 2019 first quarter. We are currently evaluating the potential impact of adopting this guidance on our consolidated financial statements and disclosures, and have been involved in industry specific discussions with the FASB on the treatment of certain items. We do not believe the adoption of ASU 2014-09 will have a material impact on the amount or timing of our homebuilding revenues. We are also continuing to evaluate the impact adopting this guidance may have on other aspects of our business. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). ASU 2016-02 will require lessees to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. Under this guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. Lessor accounting remains substantially similar to current GAAP. In addition, disclosures of leasing activities are to be expanded to include qualitative along with specific quantitative information. ASU 2016-02 is effective for us beginning December 1, 2019 (with early adoption permitted), and mandates a modified retrospective transition method. We are currently evaluating the potential impact of adopting this guidance on our consolidated financial statements. In February 2018, the FASB issued Accounting Standards Update No. 2018-02, “Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”), which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“TCJA”), and requires certain disclosures about stranded tax effects. ASU 2018-02 is effective for us beginning December 1, 2019 (with early adoption permitted), and shall be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the corporate income tax rate in the TCJA is recognized. We are currently evaluating the potential impact of adopting this guidance on our consolidated financial statements. Adoption of New Accounting Pronouncement. In March 2016, the FASB issued Accounting Standards Update No. 2016-09, “Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”), which simplified several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of excess tax benefits on the statement of cash flows, treatment of forfeitures, and statutory withholding requirements. We adopted this guidance effective December 1, 2017. ASU 2016-09 requires excess tax benefits and deficiencies from stock-based compensation awards to be recognized prospectively in our consolidated statements of operations as a component of income tax expense, whereas these items were previously recorded in paid-in capital in our consolidated balance sheets. This guidance also requires excess tax benefits to be classified within operating activities in the consolidated statements of cash flows. We previously recognized excess tax benefits as a cash inflow from financing activities and a corresponding cash outflow from operating activities. In connection with the adoption of this guidance, we elected to continue to estimate forfeitures in calculating our stock-based compensation expense, rather than account for forfeitures as they occur. The impact of recognizing excess tax benefits and deficiencies in our consolidated statements of operations resulted in a $2.2 million reduction in our income tax expense for the three months ended February 28, 2018. The remaining aspects of adopting this guidance did not have a material impact on our consolidated financial statements.

Basis of Presentation and Significant Accounting Policies

Basis of Presentation. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with GAAP have been condensed or omitted.

In our opinion, the accompanying unaudited consolidated financial statements contain all adjustments (consisting only of normal recurring accruals) necessary to present fairly our consolidated financial position as of February 28, 2018, the results of our consolidated operations for the three months ended February 28, 2018 and 2017, and our consolidated cash flows for the three months ended February 28, 2018 and 2017. The results of our consolidated operations for the three months ended February 28, 2018 are not necessarily indicative of the results to be expected for the full year due to seasonal variations in operating results and other factors. The consolidated balance sheet at November 30, 2017 has been taken from the audited consolidated financial statements as of that date. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the year ended November 30, 2017, which are contained in our Annual Report on Form 10-K for that period.

Unless the context indicates otherwise, the terms “we,” “our,” and “us” used in this report refer to KB Home, a Delaware corporation, and its subsidiaries.

Use of Estimates. The preparation of financial statements in conformity with GAAP requires management to make estimates and judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

Cash and Cash Equivalents. We consider all highly liquid short-term investments purchased with an original maturity of three months or less to be cash equivalents. Our cash equivalents totaled $347.1 million at February 28, 2018 and $481.1 million at November 30, 2017. At February 28, 2018 and November 30, 2017, the majority of our cash and cash equivalents was invested in interest-bearing bank deposit accounts.

Comprehensive Income (Loss). Our comprehensive loss for the three months ended February 28, 2018 was $71.3 million. For the three months ended February 28, 2017, our comprehensive income was $14.3 million. Our comprehensive income (loss) for each of the three-month periods ended February 28, 2018 and 2017 was equal to our net income (loss) for the respective periods.

Recent Accounting Pronouncements Not Yet Adopted. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”). The core principle of this guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In August 2015, the FASB issued Accounting Standards Update No. 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” which delayed the effective date of ASU 2014-09 by one year. In 2016 and 2017, the FASB issued accounting standards updates that amended several aspects of ASU 2014-09. ASU 2014-09, as amended, is effective for us beginning December 1, 2018, and allows for full retrospective or modified retrospective methods of adoption. We expect to adopt ASU 2014-09 under the modified retrospective method in our 2019 first quarter. We are currently evaluating the potential impact of adopting this guidance on our consolidated financial statements and disclosures, and have been involved in industry specific discussions with the FASB on the treatment of certain items. We do not believe the adoption of ASU 2014-09 will have a material impact on the amount or timing of our homebuilding revenues. We are also continuing to evaluate the impact adopting this guidance may have on other aspects of our business.

In February 2016, the FASB issued Accounting Standards Update No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). ASU 2016-02 will require lessees to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. Under this guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. Lessor accounting remains substantially similar to current GAAP. In addition, disclosures of leasing activities are to be expanded to include qualitative along with specific quantitative information. ASU 2016-02 is effective for us beginning December 1, 2019 (with early adoption permitted), and mandates a modified retrospective transition method. We are currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In February 2018, the FASB issued Accounting Standards Update No. 2018-02, “Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”), which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“TCJA”), and requires certain disclosures about stranded tax effects. ASU 2018-02 is effective for us beginning December 1, 2019 (with early adoption permitted), and shall be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the corporate income tax rate in the TCJA is recognized. We are currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

Adoption of New Accounting Pronouncement. In March 2016, the FASB issued Accounting Standards Update No. 2016-09, “Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”), which simplified several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of excess tax benefits on the statement of cash flows, treatment of forfeitures, and statutory withholding requirements. We adopted this guidance effective December 1, 2017. ASU 2016-09 requires excess tax benefits and deficiencies from stock-based compensation awards to be recognized prospectively in our consolidated statements of operations as a component of income tax expense, whereas these items were previously recorded in paid-in capital in our consolidated balance sheets. This guidance also requires excess tax benefits to be classified within operating activities in the consolidated statements of cash flows. We previously recognized excess tax benefits as a cash inflow from financing activities and a corresponding cash outflow from operating activities. In connection with the adoption of this guidance, we elected to continue to estimate forfeitures in calculating our stock-based compensation expense, rather than account for forfeitures as they occur. The impact of recognizing excess tax benefits and deficiencies in our consolidated statements of operations resulted in a $2.2 million reduction in our income tax expense for the three months ended February 28, 2018. The remaining aspects of adopting this guidance did not have a material impact on our consolidated financial statements.