Consolidated Statements of Cash Flows $ in Millions	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
OPERATING ACTIVITIES
Net income	$ 1,618.6	$ 1,462.3	$ 1,038.4
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	72.0	62.4	54.7
Amortization of discounts and fees	10.9	9.9	5.0
Stock-based compensation expense	73.2	55.8	59.2
Equity in earnings of unconsolidated entities	(0.5)	(2.8)	0.0
Distributions of earnings of unconsolidated entities	0.5	2.0	0.0
Excess income tax benefit from employee stock awards	0.0	0.0	(14.3)
Deferred income taxes	20.1	170.9	110.8
Inventory and land option charges	54.0	50.4	40.2
Gain on sale of assets	(53.9)	(18.8)	0.0
Changes in operating assets and liabilities:
(Increase) decrease in construction in progress and finished homes	84.6	(482.8)	(584.4)
(Increase) decrease in residential land and lots — developed, under development, held for development and held for sale	(676.4)	(573.8)	(362.3)
(Increase) decrease in other assets	(161.6)	(110.6)	(63.7)
(Increase) decrease in mortgage loans held for sale	(275.6)	(208.8)	67.6
Increase in accounts payable, accrued expenses and other liabilities	126.2	129.1	89.0
Net cash provided by (used in) operating activities	892.1	545.2	440.2
INVESTING ACTIVITIES
Expenditures for property and equipment	(127.2)	(68.1)	(102.7)
Proceeds from sale of assets	143.8	292.9	0.0
Expenditures related to rental properties	(96.9)	(70.2)	(54.6)
Return of investment in unconsolidated entities	4.4	17.5	0.0
Net principal decrease (increase) of other mortgage loans and real estate owned	(2.3)	(1.2)	6.2
Proceeds from (purchases of) debt securities collateralized by residential real estate	0.0	7.3	(8.8)
Payments related to business acquisitions, net of cash acquired	(315.8)	(159.2)	(4.1)
Net cash provided by (used in) investing activities	(394.0)	19.0	(164.0)
FINANCING ACTIVITIES
Proceeds from notes payable	2,528.2	2,163.5	835.0
Repayment of notes payable	(2,686.1)	(2,181.7)	(1,192.3)
Advances (payments) on mortgage repurchase facility, net	251.2	217.7	(53.0)
Proceeds from stock associated with certain employee benefit plans	42.7	47.4	46.7
Excess income tax benefit from employee stock awards	0.0	0.0	14.3
Cash paid for shares withheld for taxes	(19.7)	(10.3)	(5.1)
Cash dividends paid	(223.4)	(188.4)	(149.6)
Repurchases of common stock	(479.8)	(127.5)	(60.6)
Distributions to noncontrolling interests, net	(3.9)	(3.2)	0.0
Proceeds from Issuance of Common Stock	100.7	0.0	0.0
Net cash provided by (used in) financing activities	(490.1)	(82.5)	(564.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	8.0	481.7	(288.4)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,514.0	1,506.0	1,024.3
Supplemental cash flow information:
Income taxes paid (refunded), net	488.0	387.2	446.4
Supplemental disclosures of non-cash activities:
Notes payable issued for inventory	83.6	0.0	4.5
Stock issued under employee incentive plans	49.6	64.0	31.9
Accrued expenditures for property and equipment	14.1	10.7	16.3
Accrual for holdback payment related to acquisition	$ 10.1	$ 0.0	$ 0.0