Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Inventories:
Purchased components and raw material	$ 87.3	$ 95.2
Work in process	32.4	43.7
Finished goods	42.8	52.5
Inventories, net	162.5	191.4
Other current assets:
Prepaid Expense	10.9	9.6
Nontrade Receivables	8.5	6.3
Maintenance and repair tooling	3.7	4.2
Prepaid income taxes	5.5	4.7
Other	0.4	1.2
Other current assets	29.0	26.0
Property, plant and equipment:
Land	6.2	5.2
Buildings	80.4	68.9
Machinery and equipment	406.3	362.9
Construction in progress	57.4	48.0
Property, plant and equipment, gross	550.3	485.0
Accumulated depreciation	(296.5)	(267.9)
Property, plant and equipment, net	253.8	217.1
Other assets, noncurrent
Operating Lease, Right-of-Use Asset	25.6	0.0
Maintenance and repair supplies and tooling, Noncurrent	17.5	16.4
Nontrade Receivables, Noncurrent	1.8	1.8
Pension asset	0.9	0.0
Other Assets	3.4	2.6
Other noncurrent assets	51.3	23.9
Other current liabilities:
Compensation and benefits	35.5	28.5
Customer rebates	9.6	8.7
Interest	7.3	7.3
Warranty	7.2	6.5
Customer refund liability	4.3	3.3
Taxes other than income taxes	3.9	3.3
Deferred revenues	5.6	4.7
Operating lease liability	4.0	0.0
Restructuring	2.8	1.7
Environmental	1.2	1.2
Income taxes	0.2	0.6
Accrued settlements	0.2	0.2
Walter tax matter liability	0.0	22.0
Other current liabilities	4.8	5.0
Other current liabilities	86.6	93.0
Other liabilities, noncurrent
Operating Lease, Liability, Noncurrent	23.3	0.0
Standard Product Warranty Accrual, Noncurrent	7.2	10.7
transition tax liability	5.2	5.8
Unrecognized Tax Benefits	4.5	3.3
Asset Retirement Obligations, Noncurrent	3.5	3.6
Liability, Defined Benefit Pension Plan, Noncurrent	0.0	5.0
Workers' Compensation Liability, Noncurrent	3.8	1.9
Deferred development grant	2.5	0.0
Cares Act deferrals	3.3	0.0
Other Accrued Liabilities, Noncurrent	3.0	2.9
Other noncurrent liabilities	56.3	33.2
Workers Compensation Reimbursement [Member]
Other assets, noncurrent
Nontrade Receivables, Noncurrent	$ 2.1	$ 3.1