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Income Taxes Tables
 6 Months Ended
Mar. 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
 
Six months ended
 
March 31,
 
March 31,
 
2017
 
2016
 
2017
 
2016
Adjustments to reconcile to the effective tax rate:
 
 
 
 
 
 
 
U.S. federal statutory income tax rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State tax apportionment change
14.9

 
—

 
6.4

 
—

State income taxes, net of federal benefit
3.7

 
4.4

 
3.8

 
4.4

Excess tax benefit for stock-based compensation
(30.0
)
 
(4.2
)
 
(17.2
)
 
(3.2
)
Tax credits
(7.2
)
 
(0.6
)
 
(3.5
)
 
(0.6
)
U.S. manufacturing deduction
(4.9
)
 
(3.3
)
 
(4.1
)
 
(3.3
)
Other
1.5

 
0.9

 
1.3

 
(2.1
)
Effective tax rate
13.0
 %
 
32.2
 %
 
21.7
 %
 
30.2
 %