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Income Taxes Rate Reconciliation (Tables)
 3 Months Ended
Dec. 31, 2018
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
 
December 31,
 
2018
 
2017
U.S. federal statutory income tax rate
21.0
 %
 
24.5
 %
Adjustments to reconcile to the effective tax rate:
 
 
 
State income taxes, net of federal benefit
3.3

 
4.3

Valuation allowance adjustment related to stock compensation
—

 
(5.7
)
Excess tax benefits related to stock compensation
1.3

 
(2.8
)
Domestic production activities deduction
—

 
(1.6
)
Tax credits
0.4

 
(0.9
)
Global Intangible Low-taxed Income
(0.1
)
 
—

Other
(0.3
)
 
0.5

 
25.6
 %
 
18.3
 %
Walter Energy accrual
(5.8
)
 
—

Remeasurement related to tax law changes
2.1

 
(278.4
)
Effective income tax rate
21.9
 %
 
(260.1
)%