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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Deferred income tax assets:    
Accrued expenses $ 19.3 $ 10.8
Deferred Tax Assets Leasing Liabilities 7.5 6.4
Inventory reserves 5.0 7.2
State net operating losses 1.9 1.9
Federal net operating losses and credit carryovers 15.9 16.2
Stock-based compensation 4.3 3.9
Section 174 research and development capitalization 23.1 15.6
All other 5.3 4.4
Deferred income tax assets 82.3 66.4
Valuation allowance (18.0) (15.1)
Total deferred income tax assets 64.3 51.3
Deferred income tax liabilities:    
Intangible assets 68.2 74.5
Lease assets 6.7 5.9
Basis difference in foreign investment 6.0 5.9
Pension 3.0 1.3
Property, plant and equipment 34.7 36.6
Other 1.1 0.9
Total deferred income tax liabilities 119.7 125.1
Net deferred income tax liabilities $ 55.4 $ 73.8