Legal Matters	12 Months Ended
Nov. 30, 2014
Loss Contingency, Information about Litigation Matters [Abstract]
Legal Matters	Legal Matters Nevada Development Contract Litigation. KB Nevada is a defendant in a case in the Eighth Judicial District Court in Clark County, Nevada 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, alleged that KB Nevada breached the development agreement, and also alleged 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 sought rescission of the agreements or, in the alternative, compensatory damages of $55 million plus the Claimed Damages. KB Nevada has denied the allegations, and believes it has meritorious defenses to the consolidated plaintiffs’ claims. On March 15, 2013, the court entered orders denying the consolidated plaintiffs’ motions for summary judgment and granting the majority of KB Nevada’s motions for summary judgment, eliminating, among other of the consolidated plaintiffs’ claims, those for fraud, negligent misrepresentation, and punitive damages. With the court’s decisions, the only remaining claims against KB Nevada are for contract damages and rescission. In August 2013, the court granted motions that further narrowed the scope of the Claimed Damages. While the ultimate outcome is uncertain — we believe it is reasonably possible that the loss in this matter could range from zero to approximately $55 million plus pre-judgment interest, which could be material to our consolidated financial statements — KB Nevada believes it will be successful in defending against the consolidated plaintiffs’ remaining claims and that the consolidated plaintiffs will not be awarded rescission or damages. The non-jury trial, originally set for September 2012, is presently scheduled for September 15, 2015. Other Matters. In addition to the specific proceedings described above, we are involved in other litigation and regulatory proceedings incidental to our business that are in various procedural stages. We believe that the accruals we have recorded for probable and reasonably estimable losses with respect to these proceedings are adequate and that, as of November 30, 2014, it was not reasonably possible that an additional material loss had been incurred in an amount in excess of the estimated amounts already recognized in our consolidated financial statements. We evaluate our accruals for litigation and regulatory proceedings at least quarterly and, as appropriate, adjust them to reflect (a) the facts and circumstances known to us at the time, including information regarding negotiations, settlements, rulings and other relevant events and developments; (b) the advice and analyses of counsel; and (c) 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 our experience, we believe that the amounts that may be claimed or alleged against us in these proceedings are not a meaningful indicator of our potential liability. The outcome of any of these proceedings, including the defense and other litigation-related costs and expenses we 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 our consolidated financial statements.

Legal Matters

Nevada Development Contract Litigation. KB Nevada is a defendant in a case in the Eighth Judicial District Court in Clark County, Nevada 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, alleged that KB Nevada breached the development agreement, and also alleged 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 sought rescission of the agreements or, in the alternative, compensatory damages of $55 million plus the Claimed Damages. KB Nevada has denied the allegations, and believes it has meritorious defenses to the consolidated plaintiffs’ claims. On March 15, 2013, the court entered orders denying the consolidated plaintiffs’ motions for summary judgment and granting the majority of KB Nevada’s motions for summary judgment, eliminating, among other of the consolidated plaintiffs’ claims, those for fraud, negligent misrepresentation, and punitive damages. With the court’s decisions, the only remaining claims against KB Nevada are for contract damages and rescission. In August 2013, the court granted motions that further narrowed the scope of the Claimed Damages. While the ultimate outcome is uncertain — we believe it is reasonably possible that the loss in this matter could range from zero to approximately $55 million plus pre-judgment interest, which could be material to our consolidated financial statements — KB Nevada believes it will be successful in defending against the consolidated plaintiffs’ remaining claims and that the consolidated plaintiffs will not be awarded rescission or damages. The non-jury trial, originally set for September 2012, is presently scheduled for September 15, 2015.

Other Matters. In addition to the specific proceedings described above, we are involved in other litigation and regulatory proceedings incidental to our business that are in various procedural stages. We believe that the accruals we have recorded for probable and reasonably estimable losses with respect to these proceedings are adequate and that, as of November 30, 2014, it was not reasonably possible that an additional material loss had been incurred in an amount in excess of the estimated amounts already recognized in our consolidated financial statements. We evaluate our accruals for litigation and regulatory proceedings at least quarterly and, as appropriate, adjust them to reflect (a) the facts and circumstances known to us at the time, including information regarding negotiations, settlements, rulings and other relevant events and developments; (b) the advice and analyses of counsel; and (c) 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 our experience, we believe that the amounts that may be claimed or alleged against us in these proceedings are not a meaningful indicator of our potential liability. The outcome of any of these proceedings, including the defense and other litigation-related costs and expenses we 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 our consolidated financial statements.