Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net income	$ 795.2	$ 432.5
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	20.4	19.0
Amortization of discounts and fees	2.5	3.1
Stock-based compensation expense	21.7	16.6
Equity in earnings of unconsolidated entities	(0.9)	(0.5)
Deferred income taxes	2.9	7.2
Inventory and land option charges	8.3	3.8
Gain on sale of assets	(14.0)	(31.1)
Changes in operating assets and liabilities:
Increase in construction in progress and finished homes	(591.2)	(334.8)
Increase in residential land and lots – developed, under development, held for development and held for sale	(716.8)	(373.1)
(Increase) decrease in other assets	(124.9)	2.0
Net decrease in mortgage loans held for sale	90.1	46.9
Increase in accounts payable, accrued expenses and other liabilities	254.6	94.6
Net cash used in operating activities	(252.1)	(113.8)
INVESTING ACTIVITIES
Expenditures for property and equipment	(16.3)	(21.6)
Proceeds from sale of assets	31.8	62.8
Expenditures related to rental properties	86.2	59.6
Return of investment in unconsolidated entities	2.1	1.9
Net principal decrease (increase) of other mortgage loans and real estate owned	0.2	(0.6)
Payments related to business acquisitions	(23.0)	(0.7)
Net cash (used in) provided by investing activities	(91.4)	(17.8)
FINANCING ACTIVITIES
Proceeds from notes payable	494.1	495.7
Repayment of notes payable	(400.1)	0.0
Payments on mortgage repurchase facility, net	(163.5)	(38.6)
Proceeds from stock associated with certain employee benefit plans	0.9	4.1
Cash paid for shares withheld for taxes	(26.3)	(17.3)
Cash dividends paid	(72.9)	(64.6)
Repurchases of common stock	(53.8)	(163.1)
Distributions to noncontrolling interests, net	(0.1)	(0.4)
Other financing activities	0.0	(2.3)
Net cash (used in) provided by financing activities	(221.7)	213.5
Net (decrease) increase in cash, cash equivalents and restricted cash	(565.2)	81.9
Cash, cash equivalents and restricted cash at beginning of period	3,040.1	1,514.0
Cash, cash equivalents and restricted cash at end of period	2,474.9	1,595.9
SUPPLEMENTAL DISCLOSURES OF NON-CASH ACTIVITIES:
Notes payable issued for inventory	12.5	0.0
Stock issued under employee incentive plans	44.7	31.8
Accrued expenditures for property and equipment	21.8	7.7
Accrual for holdback payments related to acquisitions	2.6	9.5
Repurchase of common stock not settled	$ 16.0	$ 0.0