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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Components of income tax expense (benefit)
The components of the Company’s income tax expense are as follows:
 
Year Ended September 30,
 
2017
 
2016
 
2015
 
(In millions)
Current tax expense:
 

 
 

 
 

Federal
$
425.6

 
$
376.0

 
$
356.4

State
27.3

 
15.9

 
13.2

 
452.9

 
391.9

 
369.6

Deferred tax expense (benefit):
 

 
 

 
 

Federal
87.9

 
47.6

 
(3.1
)
State
22.9

 
27.7

 
6.2

 
110.8

 
75.3

 
3.1

Total income tax expense
$
563.7

 
$
467.2

 
$
372.7

Comparison of income tax expense (benefit) and tax computed at the statutory rate
Differences between income tax expense and tax computed by applying the federal statutory rate of 35% to income before income taxes during each year is due to the following:
 
Year Ended September 30,
 
2017
 
2016
 
2015
 
(In millions)
Income taxes at federal statutory rate
$
560.7

 
$
473.7

 
$
393.2

Increase (decrease) in tax resulting from:
 
 
 
 
 
State income taxes, net of federal benefit
42.3

 
38.6

 
37.0

Domestic production activities deduction
(39.8
)
 
(36.3
)
 
(35.7
)
Valuation allowance
0.8

 
0.2

 
(21.0
)
Tax credits
(3.5
)
 
(15.9
)
 
(2.2
)
Other
3.2

 
6.9

 
1.4

Total income tax expense
$
563.7

 
$
467.2

 
$
372.7

Components of deferred tax assets and liabilities
Components of deferred income taxes are summarized as follows:
 
September 30,
 
2017
 
2016
 
(In millions)
Deferred tax assets:
 

 
 

Inventory costs
$
42.6

 
$
87.6

Inventory impairments
83.9

 
128.3

Warranty and construction defect costs
163.7

 
138.8

Net operating loss carryforwards
26.2

 
40.1

Tax credit carryforwards
2.5

 
2.9

Incentive compensation plans
92.6

 
82.2

Deferred income
1.7

 
2.2

Other
13.9

 
11.1

Total deferred tax assets
427.1

 
493.2

Valuation allowance
(11.2
)
 
(10.3
)
Total deferred tax assets, net of valuation allowance
415.9

 
482.9

Deferred tax liabilities:
 
 
 
Deferral of profit on home sales
41.6

 

Other
9.3

 
6.6

Total deferred tax liabilities
$
50.9

 
$
6.6

Deferred income taxes, net
$
365.0

 
$
476.3