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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
OPERATING ACTIVITIES      
Net income $ 1,038.4 $ 886.3 $ 750.7
Adjustments to reconcile net income to net cash (used in) provided by operating activities:      
Depreciation and amortization 54.7 61.0 54.1
Amortization of discounts and fees 5.0 5.4 5.6
Stock based compensation expense 59.2 49.0 42.2
Excess income tax benefit from employee stock awards (14.3) (10.0) (12.3)
Deferred income taxes 110.8 75.3 3.1
Inventory and land option charges 40.2 31.4 60.3
Gain on sale of debt securities collateralized by residential real estate 0.0 (4.5) 0.0
Goodwill impairment 0.0 7.2 9.8
Changes in operating assets and liabilities:      
(Increase) decrease in construction in progress and finished homes (584.4) (496.2) 63.1
Increase in residential land and lots — developed, under development, held for development and held for sale (362.3) (10.3) (152.6)
(Increase) decrease in other assets (63.7) (16.3) (29.8)
Decrease (increase) in mortgage loans held for sale 67.6 (12.4) (154.1)
Increase in accounts payable, accrued expenses and other liabilities 83.9 52.1 60.3
Net cash (used in) provided by operating activities 435.1 618.0 700.4
INVESTING ACTIVITIES      
Purchases of property and equipment (157.3) (86.1) (56.1)
Proceeds from the sale of property and equipment to a related party 0.0 0.0 56.0
Decrease (increase) in restricted cash (7.0) 0.2 (0.7)
Net principal decrease (increase) of other mortgage loans and real estate owned 6.2 19.7 (8.9)
Proceeds from sale (purchases) of debt securities collateralized by residential real estate (8.8) 35.8 (14.8)
Payments related to acquisition of a business (4.1) (82.2) (70.9)
Net cash used in investing activities (171.0) (112.6) (95.4)
FINANCING ACTIVITIES      
Proceeds from notes payable 835.0 0.0 1,590.7
Repayment of notes payable (1,245.3) (549.7) (1,456.2)
Proceeds from stock associated with certain employee benefit plans 46.7 72.4 61.8
Income tax benefit from stock option exercises 14.3 10.0 12.3
Cash dividends paid (149.6) (118.7) (91.6)
Repurchases of common stock (60.6) 0.0 0.0
Net cash provided by (used in) financing activities (559.5) (586.0) 117.0
Increase (decrease) in cash and cash equivalents (295.4) (80.6) 722.0
Cash and cash equivalents at beginning of year 1,303.2 1,383.8 661.8
Cash and cash equivalents at end of year 1,007.8 1,303.2 1,383.8
Supplemental cash flow information:      
Income taxes paid (refunded), net 446.4 389.9 334.0
Supplemental disclosures of non-cash activities:      
Notes payable issued for inventory 4.5 4.2 9.7
Stock issued under employee incentive plans 31.9 20.1 8.3
Accrued expenditures for property and equipment 16.3 4.3 0.0
Accrual for holdback payment related to acquisition $ 0.0 $ 9.7 $ 0.0