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Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product Warranty Accrual, Preexisting, Increase (Decrease) | [1] |  |  |  |  |  |  |  |  | $ 0 | $ (652) | $ (7,238)
Valuation Allowance, Deferred Tax Asset, Change in Amount |  |  |  |  |  |  |  |  |  | (1,200) | (13,000) | (3,400)
Revenues |  | $ 1,403,138 | $ 1,144,001 | $ 1,002,794 | $ 818,596 | $ 1,191,942 | $ 913,283 | $ 811,050 | $ 678,371 | 4,368,529 | 3,594,646 | 3,032,030
Gross profits |  | 255,442 | 188,110 | 155,382 | 119,697 | 167,667 | 151,902 | 121,465 | 108,694 |  |  |
Inventory Impairments and Land Option Contract Abandonments |  | 7,110 | 8,113 | 6,001 | 4,008 | 36,054 | 3,052 | 11,740 | 1,966 | 25,232 | 52,812 | 9,591
Pretax income (loss) |  | 137,346 | 79,208 | 51,982 | 21,459 | 55,028 | 53,463 | 24,797 | 16,027 | 289,995 | 149,315 | 127,043
Net income |  | $ 84,346 | $ 50,208 | $ 31,782 | $ 14,259 | $ 37,528 | $ 39,363 | $ 15,597 | $ 13,127 | $ 180,595 | $ 105,615 | $ 84,643
Earnings per share: Diluted (usd per share) |  | $ 0.84 | $ 0.51 | $ 0.33 | $ 0.15 | $ 0.40 | $ 0.42 | $ 0.17 | $ 0.14 | $ 1.85 | $ 1.12 | $ 0.85
Earnings per share: Basic (usd per share) |  | $ 0.97 | $ 0.58 | $ 0.37 | $ 0.17 | $ 0.44 | $ 0.46 | $ 0.18 | $ 0.15 | $ 2.09 | $ 1.23 | $ 0.92
Land Option Contract Abandonment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on Contract Termination |  |  |  |  |  |  |  |  |  | $ 4,627 | $ 3,232 | $ 1,561
Southeast [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on Contract Termination |  |  |  |  |  |  |  |  |  | $ 556 | 1,750 | $ 984
Metro Washington, D.C. [Member] | Southeast [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on Contract Termination |  |  |  |  |  |  |  |  |  |  | $ 1,400 |
[1] | Adjustments for 2016 and 2015 included the reclassification of certain estimated minimum probable recoveries to receivables in connection with the above-noted water intrusion-related issues. The adjustments for each year had no impact on our consolidated statements of operations.

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