Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
OPERATING ACTIVITIES
Net income	$ 955.7	$ 968.3
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	20.0	19.8
Stock-based compensation expense	40.9	22.9
Deferred income taxes	11.3	3.2
Inventory and land option charges	6.1	27.5
Changes in operating assets and liabilities:
(Increase) decrease in construction in progress and finished homes	(466.4)	320.7
Increase in residential land and lots – developed, under development, held for development and held for sale	(937.8)	(637.5)
Increase in rental properties	(256.5)	(357.0)
(Increase) decrease in other assets	(130.0)	330.2
Decrease in mortgage loans held for sale	475.8	603.3
Increase (decrease) in accounts payable, accrued expenses and other liabilities	127.5	(472.3)
Net cash (used in) provided by operating activities	(153.4)	829.1
INVESTING ACTIVITIES
Expenditures for property and equipment	(47.6)	(47.5)
Proceeds from sale of assets	9.9	0.0
Payments related to business acquisitions, net of cash acquired	(1.0)	(97.1)
Other investing activities	(0.6)	1.7
Net cash used in investing activities	(39.3)	(142.9)
FINANCING ACTIVITIES
Proceeds from notes payable	720.0	300.0
Repayment of notes payable	(170.0)	(300.0)
Payments on mortgage repurchase facilities, net	(389.9)	(404.4)
Proceeds from stock associated with certain employee benefit plans	1.6	5.5
Cash paid for shares withheld for taxes	(37.5)	(25.7)
Cash dividends paid	(99.9)	(86.1)
Repurchases of common stock	(376.9)	(118.1)
Net other financing activities	(10.2)	(17.8)
Net cash used in financing activities	(362.8)	(646.6)
Net (decrease) increase in cash, cash equivalents and restricted cash	(555.5)	39.6
Cash, cash equivalents and restricted cash at beginning of period	3,900.1	2,572.9
Cash, cash equivalents and restricted cash at end of period	3,344.6	2,612.5
SUPPLEMENTAL DISCLOSURES OF NON-CASH ACTIVITIES:
Notes payable issued for inventory	21.9	31.2
Stock issued under employee incentive plans	66.5	46.9
Repurchases of common stock not settled	$ 18.3	$ 0.0