Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Accrued Liabilities, Current	$ 67.4	$ 93.0
Goodwill	97.7	95.7
Goodwill, Purchase Accounting Adjustments	0.3
Goodwill, Foreign Currency Translation Gain (Loss)	1.7
Other noncurrent liabilities	51.7	33.2
Nontrade Receivables, Noncurrent	1.8	1.8
Inventories:
Purchased components and raw material	103.9	95.2
Work in process	38.5	43.7
Finished goods	61.7	52.5
Inventories, net	204.1	191.4
Maintenance and repair tooling	4.0	4.2
Income taxes	0.5	4.7
Other	0.6	1.2
Other	22.9	26.0
Property, plant and equipment:
Land	5.2	5.2
Buildings	64.6	68.9
Machinery and equipment	381.9	362.9
Construction in progress	69.3	48.0
Property, plant and equipment, gross	521.0	485.0
Accumulated depreciation	(282.0)	(267.9)
Property, plant and equipment net	239.0	217.1
Other current liabilities:
Compensation and benefits	23.5	28.5
Interest	7.3	7.3
Warranty	6.6	6.5
Environmental	1.2	1.2
Restructuring	0.6	1.7
Walter accrual	0.0	22.0
Income taxes	2.2	0.6
Taxes other than income taxes	2.7	3.3
Asset Retirement Obligation	3.6	3.6
Customer rebates	5.6	8.7
Other Liabilities, Current	5.2	5.2
Prepaid Expense	10.8	9.6
Nontrade Receivables	7.0	6.3
Operating Lease, Right-of-Use Asset	26.7	0.0
Other noncurrent assets	51.9	23.9
Other Assets	3.2	2.6
Operating Lease, Liability, Current	4.4	0.0
Deferred Revenue	4.1	4.7
Operating Lease, Liability	28.4
Customer Refund Liability, Current	4.0	3.3
Operating Lease, Liability, Noncurrent	24.0	0.0
Transition Tax Liability	4.1	5.8
Unrecognized Tax Benefits	3.8	3.3
Liability, Defined Benefit Pension Plan, Noncurrent	2.9	5.0
Workers' Compensation Liability, Noncurrent	1.4	1.9
Other Accrued Liabilities, Noncurrent	2.5	2.9
Other noncurrent liabilities	51.7	33.2
Standard Product Warranty Accrual, Noncurrent	9.4	10.7
Nontrade Receivables, Noncurrent	1.8	1.8
Other Assets, Miscellaneous, Noncurrent	17.2	16.4
Workers Compensation Reimbursement
Nontrade Receivables, Noncurrent	3.0	3.1
Other current liabilities:
Nontrade Receivables, Noncurrent	$ 3.0	$ 3.1