Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES
Net income	$ 4,191.2	$ 2,380.5	$ 1,618.6
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	73.9	80.4	72.0
Amortization of discounts and fees	8.2	10.2	10.9
Stock-based compensation expense	91.4	77.8	73.2
Equity in earnings of unconsolidated entities	(1.0)	(0.7)	0.0
Deferred income taxes	(10.0)	14.1	20.1
Inventory and land option charges	28.6	23.8	54.0
Gain on sale of assets	(14.0)	(59.5)	(53.9)
Loss on extinguishment of debt	18.1	0.0	0.0
Changes in operating assets and liabilities:
(Increase) decrease in construction in progress and finished homes	(1,734.9)	(739.1)	84.6
Increase in residential land and lots — developed, under development, held for development and held for sale	(1,720.6)	(324.4)	(676.4)
Increase in rental properties	(303.6)	0.0	0.0
Increase in other assets	(439.7)	(150.7)	(161.6)
Increase in mortgage loans held for sale	(498.3)	(457.0)	(275.6)
Increase in accounts payable, accrued expenses and other liabilities	845.1	566.2	126.2
Net cash provided by operating activities	534.4	1,421.6	892.1
INVESTING ACTIVITIES
Expenditures for property and equipment	(93.5)	(96.5)	(127.2)
Proceeds from sale of assets	37.6	129.8	143.8
Expenditures related to rental properties	(173.9)	(190.3)	(96.9)
Payments related to business acquisitions, net of cash acquired	(24.5)	(9.7)	(315.8)
Other investing activities	2.1	0.6	2.1
Net cash used in investing activities	(252.2)	(166.1)	(394.0)
FINANCING ACTIVITIES
Proceeds from notes payable	1,541.6	2,346.1	2,528.2
Repayment of notes payable	(826.3)	(1,682.9)	(2,686.1)
Advances on mortgage repurchase facility, net	362.0	243.7	251.2
Proceeds from stock associated with certain employee benefit plans	22.7	23.4	42.7
Cash paid for shares withheld for taxes	(78.5)	(38.2)	(19.7)
Cash dividends paid	(289.3)	(256.0)	(223.4)
Repurchases of common stock	(848.4)	(360.4)	(479.8)
Distributions to noncontrolling interests, net	(0.1)	(0.7)	(3.9)
Net proceeds from issuance of Forestar common stock	33.5	0.0	100.7
Other financing activities	(2.3)	(4.4)	0.0
Net cash (used in) provided by financing activities	(85.1)	270.6	(490.1)
Net increase in cash, cash equivalents and restricted cash	197.1	1,526.1	8.0
Total cash, cash equivalents and restricted cash	3,237.2	3,040.1	1,514.0
Supplemental cash flow information:
Income taxes paid, net	1,137.8	581.3	488.0
Supplemental disclosures of non-cash activities:
Notes payable issued for inventory	12.5	5.1	83.6
Stock issued under employee incentive plans	124.7	84.4	49.6
Accrual for holdback payment related to acquisition	1.1	0.7	10.1
Repurchase of common stock not settled	$ 25.6	$ 0.0	$ 0.0