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Income Taxes Rate Reconciliation (Tables)
 9 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The reconciliation between the U.S. federal statutory income tax rate and the effective tax rate is presented below.
 
Three months ended
 
Nine months ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
U.S. federal statutory income tax rate
21.0
 %
 
24.5
 %
 
21.0
 %
 
24.5
 %
Adjustments to reconcile to the effective tax rate:
 
 
 
 
 
 
 
State income taxes, net of federal benefit
4.5

 
4.8

 
5.6

 
4.5

Excess tax (benefits) related to stock compensation
(0.3
)
 
(0.2
)
 
(1.4
)
 
(1.2
)
Domestic production activities deduction
—

 
(1.7
)
 
—

 
(1.6
)
Tax credits
(1.2
)
 
(1.1
)
 
(2.7
)
 
(1.0
)
Global Intangible Low-taxed Income
0.6

 
—

 
1.2

 
—

Reversal of uncertain tax positions
(5.2
)
 
—

 
(7.2
)
 
—

Other
1.9

 
1.9

 
3.6

 
0.2

 
21.3
 %
 
28.2
 %
 
20.0
 %
 
25.4
 %
Walter Energy Accrual
(0.4
)
 
—

 
4.6

 
—

Transition tax
—

 
—

 
(1.9
)
 
12.3

Remeasurement of deferred tax items
—

 
—

 
—

 
(69.8
)
Effective income tax rate
20.9
 %
 
28.2
 %
 
22.7
 %
 
(32.1
)%