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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016
Homebuilding revenues:
Total revenues	$ 2,904.2	$ 2,416.4
Income Before Income Taxes
Income before income taxes	318.1	241.3
Homebuilding [Member]
Homebuilding revenues:
Homebuilding revenues	2,826.1	2,361.1
Income Before Income Taxes
Income before income taxes	293.9	228.9
Homebuilding Inventories
Total homebuilding inventories	8,742.4		$ 8,340.9
Homebuilding [Member] | Corporate, Non-Segment [Member]
Homebuilding Inventories
Total homebuilding inventories	244.4		244.0
Financial Services and Other [Member]
Homebuilding revenues:
Financial services revenues	78.1	55.3
Income Before Income Taxes
Income before income taxes	24.2	12.4
Financial Services Excluding Other [Member]
Income Before Income Taxes
Income before income taxes	26.5	12.3
Homebuilding and Financial Services Excluding Other [Member]
Income Before Income Taxes
Income before income taxes	320.4	241.2
Other Segments [Member]
Income Before Income Taxes
Income before income taxes	(2.3)	0.1
East [Member] | Homebuilding [Member]
Homebuilding revenues:
Homebuilding revenues	305.9	298.1
Income Before Income Taxes
Income before income taxes	26.3	27.7
Homebuilding Inventories
Total homebuilding inventories	969.8		891.1
Midwest [Member] | Homebuilding [Member]
Homebuilding revenues:
Homebuilding revenues	151.1	123.3
Income Before Income Taxes
Income before income taxes	10.2	7.0
Homebuilding Inventories
Total homebuilding inventories	460.5		441.2
Southeast [Member] | Homebuilding [Member]
Homebuilding revenues:
Homebuilding revenues	883.4	711.6
Income Before Income Taxes
Income before income taxes	99.6	76.8
Homebuilding Inventories
Total homebuilding inventories	2,197.3		2,070.3
South Central [Member] | Homebuilding [Member]
Homebuilding revenues:
Homebuilding revenues	756.9	612.6
Income Before Income Taxes
Income before income taxes	96.5	64.7
Homebuilding Inventories
Total homebuilding inventories	2,138.8		2,075.6
Southwest [Member] | Homebuilding [Member]
Homebuilding revenues:
Homebuilding revenues	108.6	73.9
Income Before Income Taxes
Income before income taxes	4.0	2.7
Homebuilding Inventories
Total homebuilding inventories	394.0		371.1
West [Member] | Homebuilding [Member]
Homebuilding revenues:
Homebuilding revenues	620.2	541.6
Income Before Income Taxes
Income before income taxes	57.3	$ 50.0
Homebuilding Inventories
Total homebuilding inventories	$ 2,337.6		$ 2,247.6

X

- Definition

The aggregate financial services revenue and operating interest income earned during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Total of (1) improvements, (2) held-for-sale, (3) land and land under development, (4) construction-in-process, (5) mortgage loans held-in-inventory, and (6) other real estate investments which are considered inventory due to being held for sale or disposition.

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