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Income Taxes (Reconciliation of Statutory Taxes to Effective Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |
Tax at U.S. federal statutory income tax rate of 35% | $ 27.5 | $ 24.3 | $ 7.3
Adjustments to reconcile to income tax expense (benefit): |  |  |
Federal Valuation Allowance | 0.4 | 0.0 | 0.5
State income taxes, net of federal benefit | 2.7 | 3.1 | 2.0
Domestic production activities deduction | (4.5) | (3.0) | (0.5)
State tax rate change | (0.4) | 0.4 | 0.0
Excess tax benefits related to stock compensation | (2.1) | (0.5) | 0.0
Tax Credits | (1.4) | (2.0) | (1.4)
Other nondeductible expenses | 0.6 | 0.7 | 0.6
Foreign income taxes | 0.3 | 0.2 | 0.4
Nondeductible compensation | 0.5 | 0.4 | 0.3
Other income tax | 0.6 | 0.6 | (0.9)
Income tax expense (benefit) | $ 24.2 | $ 24.2 | $ 8.3

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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