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Income Taxes Income Tax Rate Reconciliation (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. federal statutory income tax rate 35.00% 35.00% 35.00% 35.00%
Adjustments to reconcile to the effective tax rate:        
State tax rate change 0.00% 0.00% 1.70% 0.00%
State income taxes, net of federal benefit 3.90% 4.50% 3.90% 4.40%
U.S. manufacturing deduction (4.70%) (4.20%) (4.50%) (3.70%)
Other 2.70% (0.10%) 2.30% 0.30%
Tax credits (1.00%) (2.20%) (1.70%) (2.80%)
Other 0.20% (0.70%) 4.60% 1.40%
Effective income tax rate 35.70% 33.70% 32.10% 31.80%