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Income Taxes Rate Reconciliation (Tables)
 3 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
U.S. federal statutory income tax rate
24.5
 %
 
35.0
 %
Adjustments to reconcile to the effective tax rate:
 
 
 
State income taxes, net of federal benefit
4.3

 
3.9

Valuation allowance adjustment related to stock compensation
(5.7
)
 
—

Excess tax benefits related to stock compensation
(2.8
)
 
(7.6
)
Domestic production activities deduction
(1.6
)
 
(3.3
)
Tax credits
(0.9
)
 
(0.8
)
Other
0.5

 
0.8

 
18.3
 %
 
28.0
 %
Remeasurement of deferred taxes for change in rates
(278.4
)
 
—

Effective income tax rate
(260.1
)%
 
28.0
 %