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Income Taxes Rate Reconciliation (Tables)
 6 Months Ended
Mar. 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
 
Six months ended
 
March 31,
 
March 31,
 
2018
 
2017
 
2018
 
2017
U.S. federal statutory income tax rate
24.5
 %
 
35.0
 %
 
24.5
 %
 
35.0
 %
Adjustments to reconcile to the effective tax rate:
 
 
 
 
 
 
 
State tax apportionment change
—

 
14.9

 
—

 
6.4

State income taxes, net of federal benefit
4.4

 
3.7

 
4.4

 
3.8

Excess tax benefits related to stock compensation
(1.1
)
 
(30.0
)
 
(1.7
)
 
(17.2
)
Domestic production activities deduction
(1.6
)
 
(4.9
)
 
(1.6
)
 
(4.1
)
Tax credits
(0.9
)
 
(7.2
)
 
(0.9
)
 
(3.5
)
Other
2.2

 
1.5

 
(0.8
)
 
1.3

 
27.5
 %
 
13.0
 %
 
23.9
 %
 
21.7
 %
Transition tax
30.7

 
—

 
18.9

 
—

Remeasurement of deferred taxes for change in rates
—

 
—

 
(107.3
)
 
—

Effective income tax rate
58.2
 %
 
13.0
 %
 
(64.5
)%
 
21.7
 %