Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
OPERATING ACTIVITIES
Net income	$ 4,806.0	$ 4,795.2	$ 5,895.6
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	87.1	91.6	81.4
Stock-based compensation expense	118.1	111.2	105.1
Deferred income taxes	19.0	(45.9)	29.1
Inventory and land option charges	78.8	80.3	70.4
Changes in operating assets and liabilities:
Decrease (increase) in construction in progress and finished homes	141.3	861.8	(2,059.0)
Increase in residential land and lots — developed, under development, held for development and held for sale	(2,576.5)	(1,226.4)	(1,402.8)
Increase in rental properties	(214.6)	(151.8)	(1,723.2)
(Increase) decrease in other assets	(331.4)	23.8	(1,111.5)
Decrease (increase) in mortgage loans held for sale	42.4	(133.9)	(358.8)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	19.6	(101.8)	1,035.5
Net cash provided by operating activities	2,189.8	4,304.1	561.8
INVESTING ACTIVITIES
Expenditures for property and equipment	(165.3)	(148.6)	(148.2)
Proceeds from sale of assets	19.4	52.0	0.0
Payments related to business acquisitions, net of cash acquired	(40.4)	(212.9)	(271.5)
Other investing activities	(4.3)	(0.7)	4.8
Net cash used in investing activities	(190.6)	(310.2)	(414.9)
FINANCING ACTIVITIES
Proceeds from notes payable	2,086.3	711.0	4,250.0
Repayment of notes payable	(1,055.8)	(1,823.9)	(3,801.2)
(Repayment) borrowings on mortgage repurchase facilities, net	(135.8)	51.3	123.7
Proceeds from stock associated with certain employee benefit plans	20.6	25.5	33.2
Cash paid for shares withheld for taxes	(83.9)	(56.1)	(62.0)
Cash dividends paid	(395.2)	(341.2)	(316.5)
Repurchases of common stock	(1,787.5)	(1,178.5)	(1,131.5)
Net proceeds from issuance of Forestar common stock	19.7	0.0	1.7
Net other financing activities	(23.7)	(54.8)	91.4
Net cash used in financing activities	(1,355.3)	(2,666.7)	(811.2)
Net increase (decrease) in cash, cash equivalents and restricted cash	643.9	1,327.2	(664.3)
Total cash, cash equivalents and restricted cash	4,544.0	3,900.1	2,572.9
Supplemental cash flow information:
Income taxes paid, net	1,669.7	1,442.0	1,701.1
Supplemental disclosures of non-cash activities:
Notes payable issued for inventory	43.4	54.5	64.3
Reduction of notes payable upon deconsolidation of variable interest entity	(127.8)	0.0	0.0
Stock issued under employee incentive plans	$ 174.3	$ 111.4	$ 130.9