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Income Taxes Income Tax Rate Reconciliation (Details)
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
U.S. federal statutory income tax rate 35.00% 35.00%
Adjustments to reconcile to the effective tax rate:    
State income taxes, net of federal benefit 3.90% 4.30%
Tax benefits from stock compensation 7.60% 0.00%
U.S. manufacturing deduction 3.30% 3.20%
Tax credits 0.80% 11.20%
Other (0.80%) (0.40%)
Effective income tax rate 28.00% 24.50%