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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Deferred income tax assets: |  |
Inventory reserves | $ 10.4 | $ 12.0
Accrued expenses | 13.3 | 14.9
Pension and other postretirement benefits | 0.0 | 6.0
Stock-based compensation | 3.3 | 6.2
State net operating losses | 3.2 | 3.2
Federal net operating losses and credit carryovers | 2.1 | 0.9
All other | 1.0 | 2.7
Deferred income tax assets | 33.3 | 45.9
Valuation allowance | (1.9) | (1.5)
Total deferred income tax assets | 31.4 | 44.4
Deferred income tax liabilities: |  |
Identifiable intangible assets | (95.7) | (151.2)
Pension and other postretirement benefits | 2.3 | 0.0
Other | (11.4) | (7.2)
Total deferred income tax liabilities | 109.4 | 158.4
Net deferred income tax liabilities | 78.0 | 114.0
Deferred Tax Liabilities, Gross, Noncurrent | 79.2 | 115.1
Included in other noncurrent assets | $ 1.2 | $ 1.1

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