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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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