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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Summary of quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 3,741.3 | $ 3,231.9 | $ 2,767.9 | $ 2,416.4 | $ 3,172.5 | $ 2,950.8 | $ 2,398.0 | $ 2,302.6 | $ 12,157.4 | $ 10,824.0 | $ 8,024.9
Income before income taxes | 433.0 | 378.6 | 300.5 | 241.3 | 338.8 | 333.8 | 230.1 | 220.7 | 1,353.5 | 1,123.4 | 814.2
Income Tax Expense (Benefit) | 149.4 | 128.8 | 105.4 | 83.6 | 99.9 | 112.4 | 82.2 | 78.2 | 467.2 | 372.7 | 280.7
Net income | $ 283.6 | $ 249.8 | $ 195.1 | $ 157.7 | $ 238.9 | $ 221.4 | $ 147.9 | $ 142.5 | $ 886.3 | $ 750.7 | $ 533.5
Basic net income (loss) per common share | $ 0.76 | $ 0.67 | $ 0.53 | $ 0.43 | $ 0.65 | $ 0.60 | $ 0.40 | $ 0.39 | $ 2.39 | $ 2.05 | $ 1.57
Net income per common share assuming dilution | $ 0.75 | $ 0.66 | $ 0.52 | $ 0.42 | $ 0.64 | $ 0.60 | $ 0.40 | $ 0.39 | $ 2.36 | $ 2.03 | $ 1.50
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Production Related Impairments or Charges | $ 15.4 | $ 8.1 | $ 6.0 | $ 2.0 | $ 26.3 | $ 15.4 | $ 12.5 | $ 6.0 | $ 31.4 | $ 60.3 | $ 85.2
Gross profit | $ 732.6 | $ 625.8 | $ 531.7 | $ 468.9 | $ 582.3 | $ 556.0 | $ 446.5 | $ 438.6 | 2,359.2 | 2,023.3 | 1,589.9
Income before income taxes |  |  |  |  |  |  |  |  | $ 1,264.4 | $ 1,018.3 | $ 768.5

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