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Income Taxes
 9 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
Note 4. Income Taxes
At June 30, 2017 and September 30, 2016, the gross liabilities for unrecognized income tax benefits were $3.0 million and $2.8 million, respectively.
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,
 
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
—

 
—

 
1.7

 
—

State income taxes, net of federal benefit
3.9

 
4.5

 
3.9

 
4.4

Excess tax benefit for stock-based compensation
(0.2
)
 
0.7

 
(4.6
)
 
(1.4
)
Tax credits
(1.0
)
 
(2.2
)
 
(1.7
)
 
(2.8
)
U.S. manufacturing deduction
(4.7
)
 
(4.2
)
 
(4.5
)
 
(3.7
)
Other
2.7

 
(0.1
)
 
2.3

 
0.3

Effective tax rate
35.7
 %
 
33.7
 %
 
32.1
 %
 
31.8
 %
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,
 
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
—

 
—

 
1.7

 
—

State income taxes, net of federal benefit
3.9

 
4.5

 
3.9

 
4.4

Excess tax benefit for stock-based compensation
(0.2
)
 
0.7

 
(4.6
)
 
(1.4
)
Tax credits
(1.0
)
 
(2.2
)
 
(1.7
)
 
(2.8
)
U.S. manufacturing deduction
(4.7
)
 
(4.2
)
 
(4.5
)
 
(3.7
)
Other
2.7

 
(0.1
)
 
2.3

 
0.3

Effective tax rate
35.7
 %
 
33.7
 %
 
32.1
 %
 
31.8
 %