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Supplemental Guarantor Information (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | May 31, 2018 | Nov. 30, 2017 | May 31, 2017 | Nov. 30, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 670,554 | $ 720,861 | $ 349,372 | $ 593,000
Receivables | 275,620 | 244,213 |  |
Inventory, Operative Builders | 3,464,002 | 3,263,386 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 69,015 | 64,794 |  |
Deferred tax assets, net | 495,969 | 633,637 |  |
Other assets | 111,024 | 102,498 |  |
Investments in and Advances to Affiliates, Amount of Equity | 0 | 0 |  |
Total assets | 5,094,736 | 5,041,515 |  |
Due from Affiliates | 0 | 0 |  |
Liabilities and stockholders' equity |  |  |  |
Accounts payable, accrued expenses and other liabilities | 825,021 | 789,393 |  |
Mortgages and notes payable | 2,353,848 | 2,324,845 |  |
Financial services | 1,224 | 966 |  |
Due to Affiliate | 0 | 0 |  |
Stockholders' equity | 1,914,643 | 1,926,311 |  |
Total liabilities and stockholders’ equity | 5,094,736 | 5,041,515 |  |
KB Home Corporate |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 542,126 | 575,193 | 297,258 | 463,100
Receivables | 7,486 | 24,815 |  |
Inventory, Operative Builders | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 | 0 |  |
Deferred tax assets, net | 204,006 | 250,747 |  |
Other assets | 97,866 | 91,592 |  |
Investments in and Advances to Affiliates, Amount of Equity | 55,834 | 49,776 |  |
Total assets | 4,377,780 | 4,406,360 |  |
Due from Affiliates | 3,470,462 | 3,414,237 |  |
Liabilities and stockholders' equity |  |  |  |
Accounts payable, accrued expenses and other liabilities | 135,927 | 163,984 |  |
Mortgages and notes payable | 2,292,332 | 2,289,532 |  |
Financial services | 0 | 0 |  |
Due to Affiliate | 34,878 | 26,533 |  |
Stockholders' equity | 1,914,643 | 1,926,311 |  |
Total liabilities and stockholders’ equity | 4,377,780 | 4,406,360 |  |
Guarantor Subsidiaries |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 93,948 | 102,661 | 42,386 | 100,439
Receivables | 189,853 | 144,076 |  |
Inventory, Operative Builders | 3,122,164 | 2,929,466 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 66,512 | 62,290 |  |
Deferred tax assets, net | 178,134 | 243,523 |  |
Other assets | 10,331 | 8,424 |  |
Investments in and Advances to Affiliates, Amount of Equity | 0 | 0 |  |
Total assets | 3,660,942 | 3,490,440 |  |
Due from Affiliates | 0 | 0 |  |
Liabilities and stockholders' equity |  |  |  |
Accounts payable, accrued expenses and other liabilities | 441,864 | 371,909 |  |
Mortgages and notes payable | 36,406 | 9,283 |  |
Financial services | 0 | 0 |  |
Due to Affiliate | 3,182,672 | 3,109,248 |  |
Stockholders' equity | 0 | 0 |  |
Total liabilities and stockholders’ equity | 3,660,942 | 3,490,440 |  |
Non-Guarantor Subsidiaries |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 34,480 | 43,007 | 9,728 | 29,461
Receivables | 78,281 | 75,322 |  |
Inventory, Operative Builders | 341,838 | 333,920 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 2,503 | 2,504 |  |
Deferred tax assets, net | 113,829 | 139,367 |  |
Other assets | 2,827 | 2,482 |  |
Investments in and Advances to Affiliates, Amount of Equity | 0 | 0 |  |
Total assets | 709,054 | 716,720 |  |
Due from Affiliates | 126,744 | 107,992 |  |
Liabilities and stockholders' equity |  |  |  |
Accounts payable, accrued expenses and other liabilities | 247,230 | 253,500 |  |
Mortgages and notes payable | 25,110 | 26,030 |  |
Financial services | 1,224 | 966 |  |
Due to Affiliate | 379,656 | 386,448 |  |
Stockholders' equity | 55,834 | 49,776 |  |
Total liabilities and stockholders’ equity | 709,054 | 716,720 |  |
Homebuilding [Member] |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 669,798 | 720,630 | 348,588 |
Total assets | 5,085,428 | 5,029,158 |  |
Liabilities and stockholders' equity |  |  |  |
Total Liabilities Homebuilding | 3,178,869 | 3,114,238 |  |
Homebuilding [Member] | KB Home Corporate |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 542,126 | 575,193 |  |
Total assets | 851,484 | 942,347 |  |
Liabilities and stockholders' equity |  |  |  |
Total Liabilities Homebuilding | 2,428,259 | 2,453,516 |  |
Homebuilding [Member] | Guarantor Subsidiaries |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 93,948 | 102,661 |  |
Total assets | 3,660,942 | 3,490,440 |  |
Liabilities and stockholders' equity |  |  |  |
Total Liabilities Homebuilding | 478,270 | 381,192 |  |
Homebuilding [Member] | Non-Guarantor Subsidiaries |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 33,724 | 42,776 |  |
Total assets | 573,002 | 596,371 |  |
Liabilities and stockholders' equity |  |  |  |
Total Liabilities Homebuilding | 272,340 | 279,530 |  |
Financial services [Member] |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 756 | 231 | 784 |
Receivables | 1,535 | 1,724 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 6,973 | 10,340 |  |
Other assets | 44 | 62 |  |
Total assets | 9,308 | 12,357 |  |
Liabilities and stockholders' equity |  |  |  |
Accounts payable, accrued expenses and other liabilities | 1,224 | 966 |  |
Financial services [Member] | KB Home Corporate |  |  |  |
Assets |  |  |  |
Total assets | 0 | 0 |  |
Financial services [Member] | Guarantor Subsidiaries |  |  |  |
Assets |  |  |  |
Total assets | 0 | 0 |  |
Financial services [Member] | Non-Guarantor Subsidiaries |  |  |  |
Assets |  |  |  |
Total assets | 9,308 | 12,357 |  |
Consolidating Adjustments |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 0 | 0 | $ 0 | $ 0
Receivables | 0 | 0 |  |
Inventory, Operative Builders | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 | 0 |  |
Deferred tax assets, net | 0 | 0 |  |
Other assets | 0 | 0 |  |
Investments in and Advances to Affiliates, Amount of Equity | (55,834) | (49,776) |  |
Total assets | (3,653,040) | (3,572,005) |  |
Due from Affiliates | (3,597,206) | (3,522,229) |  |
Liabilities and stockholders' equity |  |  |  |
Accounts payable, accrued expenses and other liabilities | 0 | 0 |  |
Mortgages and notes payable | 0 | 0 |  |
Financial services | 0 | 0 |  |
Due to Affiliate | (3,597,206) | (3,522,229) |  |
Stockholders' equity | (55,834) | (49,776) |  |
Total liabilities and stockholders’ equity | (3,653,040) | (3,572,005) |  |
Consolidating Adjustments | Homebuilding [Member] |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 0 | 0 |  |
Total assets | 0 | 0 |  |
Liabilities and stockholders' equity |  |  |  |
Total Liabilities Homebuilding | 0 | 0 |  |
Consolidating Adjustments | Financial services [Member] |  |  |  |
Assets |  |  |  |
Total assets | $ 0 | $ 0 |  |

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