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Supplemental Balance Sheet Information (Schedule of Accrued Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Other current liabilities:    
Compensation and benefits $ 29.6 $ 58.3
Customer rebates 21.8 16.9
Accrued Income Taxes 16.0 5.6
Warranty accrual 11.8 13.3
Deferred Revenue, Current 7.0 7.1
Customer Refund Liability, Current 6.4 7.3
Accrual for Taxes Other than Income Taxes 3.5 3.5
Operating lease liability, current 5.7 5.5
Workers' Compensation Liability, Current 4.5 4.6
Restructuring reserve, current 3.6 3.4
Interest Payable 0.8 5.3
Other Liabilities, Current 9.9 16.5
Accrued liabilities 120.6 147.3
Other Liabilities, Noncurrent [Abstract]    
Operating lease liability, noncurrent 22.0 22.5
Product Warranty Accrual, Noncurrent 9.2 10.3
Transition Tax Liability 1.7 1.7
Unrecognized Tax Benefits 3.4 3.0
New market tax credit liabilities 3.9 3.9
Workers' Compensation Liability, Noncurrent 5.8 5.8
Accrued Environmental Loss Contingencies, Noncurrent 4.2 4.2
Deferred Revenue, Noncurrent 5.6 5.7
Grant yet to be earned 2.5 2.5
Other Accrued Liabilities, Noncurrent 2.7 4.1
Other Liabilities, Noncurrent, Total $ 61.0 $ 63.7