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Income Taxes - Schedule of Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Deferred tax assets:    
Share-based compensation $ 12.2 $ 7.4
Deferred compensation 5.4 5.4
Net operating loss carryforwards 19.6 17.2
Intangible assets 1.3 3.8
Bad debt reserve 7.2 9.6
Hedging 0.0 5.9
Foreign tax credit carryforwards 1.2 0.6
Other compensation 7.5 7.8
Pension 2.5 3.6
Right of use assets 30.1 20.1
Property and equipment 3.4 0.0
Other 1.6 1.1
Total gross deferred tax assets 92.0 82.5
Less valuation allowance (15.5) (12.4)
Deferred tax assets 76.5 70.1
Deferred income tax liabilities:    
Unrealized gain on securities 3.1 2.8
Prepaid expenses 2.5 5.0
Property and equipment 0.0 1.6
Right of use liabilities 26.7 17.2
Mark to market on inventory 3.8 4.8
Other deferred liabilities 0.5 1.4
Hedging 2.2 0.0
Deferred income tax liabilities 38.8 32.8
Deferred income taxes, net $ 37.7 $ 37.3