Legal Matters	12 Months Ended
Nov. 30, 2011
Commitments and Contingencies and Legal Matters [Abstract]
Legal Matters	Note 14. Legal Matters Nevada Development Contract Litigation. On November 4, 2011, the Eighth Judicial District Court, Clark County, Nevada set for trial a consolidated action against KB Nevada, in a case entitled Las Vegas Development Associates, LLC, Essex Real Estate Partners, LLC, et. al. v. KB HOME Nevada Inc. In 2007, LVDA agreed to purchase from KB Nevada approximately 83 acres of land located near Las Vegas, Nevada. LVDA subsequently assigned its rights to Essex. KB Nevada and Essex entered into a development agreement relating to certain major infrastructure improvements. LVDA’s and Essex’s complaint, initially filed in 2008, alleges that KB Nevada breached the development agreement, and also alleges that KB Nevada fraudulently induced them to enter into the purchase and development agreements. LVDA’s and Essex’s lenders subsequently filed related actions that were consolidated into the LVDA/Essex matter. The consolidated plaintiffs seek rescission of the agreements or a rescissory measure of damages or, in the alternative, the Claimed Damages. KB Nevada denies the allegations, and believes it has meritorious defenses to the consolidated plaintiffs’ claims. While the ultimate outcome is uncertain — the Company believes it is reasonably possible that the loss in this matter could range from zero to the amount of the Claimed Damages and could be material to its consolidated financial statements — KB Nevada believes it will be successful in defending against the plaintiffs’ claims and that the plaintiffs will not be awarded rescission or damages. The trial is currently set for September 2012. Southern California Project Development Case. On December 27, 2011, the jury in a case entitled KB HOME Coastal Inc. et al. adv. Estancia Coastal, returned a verdict against KB HOME Coastal Inc., a wholly owned subsidiary, and the Company for $9.8 million, excluding legal fees and interest. The case related to a land option contract and a construction agreement between KB HOME Coastal Inc. and the plaintiff. Based on pre-trial analysis, the verdict was not expected, and KB HOME Coastal Inc. and the Company intend to file a motion for judgment notwithstanding the verdict and a motion for a new trial, ahead of a possible appeal of what they believe was an incorrect result. While the ultimate outcome is uncertain, KB HOME Coastal Inc. and the Company believe they will be successful in resolving the matter for an amount less than the jury’s verdict. The ultimate loss for this matter is estimated to range from $4 million to $12 million, including legal fees and interest. In accordance with Accounting Standards Codification Topic No. 450, “Contingencies,” as no amount in that range appears to be a better estimate than any other amount, the Company’s consolidated financial statements at November 30, 2011 included an accrual of $4.0 million for this matter. However, it is reasonably possible that the loss could exceed the amount accrued within the estimated range described above. In addition to the specific proceedings described above, the Company is involved in other litigation and regulatory proceedings incidental to its business that are in various procedural stages. The Company believes that the accruals it has recorded for probable and reasonably estimable losses with respect to these proceedings are adequate and that, as of November 30, 2011, it was not reasonably possible that an additional material loss had been incurred in an amount in excess of the estimated amounts already recognized on the Company’s consolidated financial statements. The Company evaluates its accruals for litigation and regulatory proceedings at least quarterly and, as appropriate, adjusts them to reflect (i) the facts and circumstances known to the Company at the time, including information regarding negotiations, settlements, rulings and other relevant events and developments; (ii) the advice and analyses of counsel; and (iii) the assumptions and judgment of management. Similar factors and considerations are used in establishing new accruals for proceedings as to which losses have become probable and reasonably estimable at the time an evaluation is made. Based on its experience, the Company believes that the amounts that may be claimed or alleged against it in these proceedings are not a meaningful indicator of its potential liability. The outcome of any of these proceedings, including the defense and other litigation-related costs and expenses the Company may incur, however, is inherently uncertain and could differ significantly from the estimate reflected in a related accrual, if made. Therefore, it is possible that the ultimate outcome of any proceeding, if in excess of a related accrual or if no accrual had been made, could be material to the Company’s consolidated financial statements.

Legal Matters

12 Months Ended

Nov. 30, 2011

Commitments and Contingencies and Legal Matters [Abstract]

Note 14. Legal Matters

Nevada Development Contract Litigation. On November 4, 2011, the Eighth Judicial District Court, Clark County, Nevada set for trial a consolidated action against KB Nevada, in a case entitled Las Vegas Development Associates, LLC, Essex Real Estate Partners, LLC, et. al. v. KB HOME Nevada Inc. In 2007, LVDA agreed to purchase from KB Nevada approximately 83 acres of land located near Las Vegas, Nevada. LVDA subsequently assigned its rights to Essex. KB Nevada and Essex entered into a development agreement relating to certain major infrastructure improvements. LVDA’s and Essex’s complaint, initially filed in 2008, alleges that KB Nevada breached the development agreement, and also alleges that KB Nevada fraudulently induced them to enter into the purchase and development agreements. LVDA’s and Essex’s lenders subsequently filed related actions that were consolidated into the LVDA/Essex matter. The consolidated plaintiffs seek rescission of the agreements or a rescissory measure of damages or, in the alternative, the Claimed Damages. KB Nevada denies the allegations, and believes it has meritorious defenses to the consolidated plaintiffs’ claims. While the ultimate outcome is uncertain — the Company believes it is reasonably possible that the loss in this matter could range from zero to the amount of the Claimed Damages and could be material to its consolidated financial statements — KB Nevada believes it will be successful in defending against the plaintiffs’ claims and that the plaintiffs will not be awarded rescission or damages. The trial is currently set for September 2012.

Southern California Project Development Case. On December 27, 2011, the jury in a case entitled KB HOME Coastal Inc. et al. adv. Estancia Coastal, returned a verdict against KB HOME Coastal Inc., a wholly owned subsidiary, and the Company for $9.8 million, excluding legal fees and interest. The case related to a land option contract and a construction agreement between KB HOME Coastal Inc. and the plaintiff. Based on pre-trial analysis, the verdict was not expected, and KB HOME Coastal Inc. and the Company intend to file a motion for judgment notwithstanding the verdict and a motion for a new trial, ahead of a possible appeal of what they believe was an incorrect result. While the ultimate outcome is uncertain, KB HOME Coastal Inc. and the Company believe they will be successful in resolving the matter for an amount less than the jury’s verdict. The ultimate loss for this matter is estimated to range from $4 million to $12 million, including legal fees and interest. In accordance with Accounting Standards Codification Topic No. 450, “Contingencies,” as no amount in that range appears to be a better estimate than any other amount, the Company’s consolidated financial statements at November 30, 2011 included an accrual of $4.0 million for this matter. However, it is reasonably possible that the loss could exceed the amount accrued within the estimated range described above.

In addition to the specific proceedings described above, the Company is involved in other litigation and regulatory proceedings incidental to its business that are in various procedural stages. The Company believes that the accruals it has recorded for probable and reasonably estimable losses with respect to these proceedings are adequate and that, as of November 30, 2011, it was not reasonably possible that an additional material loss had been incurred in an amount in excess of the estimated amounts already recognized on the Company’s consolidated financial statements. The Company evaluates its accruals for litigation and regulatory proceedings at least quarterly and, as appropriate, adjusts them to reflect (i) the facts and circumstances known to the Company at the time, including information regarding negotiations, settlements, rulings and other relevant events and developments; (ii) the advice and analyses of counsel; and (iii) the assumptions and judgment of management. Similar factors and considerations are used in establishing new accruals for proceedings as to which losses have become probable and reasonably estimable at the time an evaluation is made. Based on its experience, the Company believes that the amounts that may be claimed or alleged against it in these proceedings are not a meaningful indicator of its potential liability. The outcome of any of these proceedings, including the defense and other litigation-related costs and expenses the Company may incur, however, is inherently uncertain and could differ significantly from the estimate reflected in a related accrual, if made. Therefore, it is possible that the ultimate outcome of any proceeding, if in excess of a related accrual or if no accrual had been made, could be material to the Company’s consolidated financial statements.