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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Summary of quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,159.1 | $ 3,776.4 | $ 3,251.3 | $ 2,904.2 | $ 3,741.3 | $ 3,231.9 | $ 2,767.9 | $ 2,416.4 | $ 14,091.0 | $ 12,157.4 | $ 10,824.0
Income before income taxes | 485.5 | 444.5 | 353.9 | 318.1 | 433.0 | 378.6 | 300.5 | 241.3 | 1,602.1 | 1,353.5 | 1,123.4
Income Tax Expense (Benefit) | 172.3 | 155.5 | 124.7 | 111.2 | 149.4 | 128.8 | 105.4 | 83.6 | 563.7 | 467.2 | 372.7
Net income | $ 313.2 | $ 289.0 | $ 229.2 | $ 206.9 | $ 283.6 | $ 249.8 | $ 195.1 | $ 157.7 | $ 1,038.4 | $ 886.3 | $ 750.7
Basic net income (loss) per common share | $ 0.84 | $ 0.77 | $ 0.61 | $ 0.55 | $ 0.76 | $ 0.67 | $ 0.53 | $ 0.43 | $ 2.77 | $ 2.39 | $ 2.05
Net income per common share assuming dilution | $ 0.82 | $ 0.76 | $ 0.60 | $ 0.55 | $ 0.75 | $ 0.66 | $ 0.52 | $ 0.42 | $ 2.74 | $ 2.36 | $ 2.03
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 802.5 | $ 723.4 | $ 614.5 | $ 558.2 | $ 732.6 | $ 625.8 | $ 531.7 | $ 468.9 | $ 2,698.7 | $ 2,359.2 | $ 2,023.3
Income before income taxes |  |  |  |  |  |  |  |  | $ 1,489.3 | $ 1,264.4 | $ 1,018.3

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