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Income Taxes
 3 Months Ended
Dec. 31, 2016
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
Income Taxes
At December 31, 2016 and September 30, 2016, the gross liabilities for unrecognized income tax benefits were $2.8 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
 
December 31,
 
2016
 
2015
U.S. federal statutory income tax rate
35.0
 %
 
35.0
 %
Adjustments to reconcile to the effective tax rate:
 
 
 
State income taxes, net of federal benefit
3.9

 
4.3

Tax benefits from stock compensation
(7.6
)
 
—

U.S. manufacturing deduction
(3.3
)
 
(3.2
)
Tax credits
(0.8
)
 
(11.2
)
Other
0.8

 
(0.4
)
Effective income tax rate
28.0
 %
 
24.5
 %
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,
 
2016
 
2015
U.S. federal statutory income tax rate
35.0
 %
 
35.0
 %
Adjustments to reconcile to the effective tax rate:
 
 
 
State income taxes, net of federal benefit
3.9

 
4.3

Tax benefits from stock compensation
(7.6
)
 
—

U.S. manufacturing deduction
(3.3
)
 
(3.2
)
Tax credits
(0.8
)
 
(11.2
)
Other
0.8

 
(0.4
)
Effective income tax rate
28.0
 %
 
24.5
 %