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Supplemental Guarantor Information (Condensed Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2014
Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,191,942 | $ 913,283 | $ 811,050 | $ 678,371 | $ 985,783 | $ 843,157 | $ 622,969 | $ 580,121 |  | $ 3,594,646 | $ 3,032,030 | $ 2,400,949
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,582,943 | 3,020,987 | 2,389,643
Construction and land costs |  |  |  |  |  |  |  |  |  | (3,041,101) | (2,539,368) | (1,985,651)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (389,441) | (342,998) | (288,023)
Operating income |  |  |  |  |  |  |  |  |  | 152,401 | 138,621 | 115,969
Interest income |  |  |  |  |  |  |  |  |  | 529 | 458 | 443
Interest Expense |  |  |  |  |  |  |  |  |  | (5,900) | (21,856) | (30,750)
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | (5,601) | 2,488 | 1,427
Pretax income (loss) | 55,028 | 53,463 | 24,797 | 16,027 | 69,917 | 33,954 | 12,673 | 10,499 |  | 149,315 | 127,043 | 94,949
Income tax benefit (expense) |  |  |  |  |  |  |  |  | $ 824,200 | (43,700) | (42,400) | 823,400
Income (Loss) from Subsidiaries, Net of Tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income | $ 37,528 | $ 39,363 | $ 15,597 | $ 13,127 | $ 44,017 | $ 23,254 | $ 9,573 | $ 7,799 |  | 105,615 | 84,643 | 918,349
KB Home Corporate |  |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction and land costs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (91,859) | (86,053) | (68,717)
Operating income |  |  |  |  |  |  |  |  |  | (91,859) | (86,053) | (68,717)
Interest income |  |  |  |  |  |  |  |  |  | 470 | 451 | 432
Interest Expense |  |  |  |  |  |  |  |  |  | (177,329) | (180,701) | (165,485)
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  |  | 301,432 | 289,727 | 287,017
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | 0 | 0 |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 32,714 | 23,424 | 53,247
Income tax benefit (expense) |  |  |  |  |  |  |  |  |  | 17,200 | 2,000 | 215,691
Income (Loss) from Subsidiaries, Net of Tax |  |  |  |  |  |  |  |  |  | 55,701 | 59,219 | 649,411
Net income |  |  |  |  |  |  |  |  |  | 105,615 | 84,643 | 918,349
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,169,545 | 2,640,678 | 2,017,170
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,169,545 | 2,640,678 | 2,017,170
Construction and land costs |  |  |  |  |  |  |  |  |  | (2,661,888) | (2,196,228) | (1,658,925)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (251,384) | (213,292) | (176,795)
Operating income |  |  |  |  |  |  |  |  |  | 256,273 | 231,158 | 181,450
Interest income |  |  |  |  |  |  |  |  |  | 55 | 6 | 9
Interest Expense |  |  |  |  |  |  |  |  |  | (3,958) | (6,184) | (6,056)
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  |  | (107,388) | (101,540) | (118,901)
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | (2,179) | (1,803) |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 142,803 | 121,637 | 53,953
Income tax benefit (expense) |  |  |  |  |  |  |  |  |  | (52,700) | (46,700) | 507,997
Income (Loss) from Subsidiaries, Net of Tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  |  | 90,103 | 74,937 | 561,950
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 425,101 | 391,352 | 383,779
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 413,398 | 380,309 | 372,473
Construction and land costs |  |  |  |  |  |  |  |  |  | (379,213) | (343,140) | (326,726)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (46,198) | (43,653) | (42,511)
Operating income |  |  |  |  |  |  |  |  |  | (12,013) | (6,484) | 3,236
Interest income |  |  |  |  |  |  |  |  |  | 4 | 1 | 2
Interest Expense |  |  |  |  |  |  |  |  |  | 3,946 | 0 | 0
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  |  | (14,711) | (23,158) | (27,325)
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | (2) | (1) |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | (26,202) | (18,018) | (12,251)
Income tax benefit (expense) |  |  |  |  |  |  |  |  |  | (8,200) | 2,300 | 99,712
Income (Loss) from Subsidiaries, Net of Tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  |  | (34,402) | (15,718) | 87,461
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,582,943 | 3,020,987 | 2,389,643
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | (2,181) | (1,804) | 741
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 144,849 | 115,419 | 86,403
Homebuilding [Member] | KB Home Corporate |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  | 0
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 32,714 | 23,424 | 53,247
Homebuilding [Member] | Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  | (2,549)
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 142,803 | 121,637 | 53,953
Homebuilding [Member] | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  | 3,290
Pretax income (loss) |  |  |  |  |  |  |  |  |  | (30,668) | (29,642) | (20,797)
Financial services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 7,886 | 7,332 | 7,860
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | (3,420) | 4,292 | 686
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 4,466 | 11,624 | 8,546
Financial services [Member] | KB Home Corporate |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financial services [Member] | Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financial services [Member] | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 4,466 | 11,624 | 8,546
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction and land costs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest Expense |  |  |  |  |  |  |  |  |  | 179,333 | 165,029 | 140,791
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  |  | (179,333) | (165,029) | (140,791)
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | 0 | 0 |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income tax benefit (expense) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (Loss) from Subsidiaries, Net of Tax |  |  |  |  |  |  |  |  |  | (55,701) | (59,219) | (649,411)
Net income |  |  |  |  |  |  |  |  |  | (55,701) | (59,219) | (649,411)
Consolidating Adjustments | Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  | 0
Pretax income (loss) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Consolidating Adjustments | Financial services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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