Supplementary Financial Statement Information (Details) - USD ($)	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Product Warranty Liability [Line Items]
Standard Product Warranty Accrual, Additions from Business Acquisition	$ 200,000	$ 0	$ 1,500,000
Payments to Acquire Investments	$ 26,600,000	$ 0	0
Percentage of LIFO Inventory	30.00%	23.00%
Research and Development Expense	$ 139,500,000	$ 135,600,000	133,700,000
Capitalized Computer Software, Additions	8,000,000.0	2,400,000
Excess of Replacement or Current Costs over Stated LIFO Value	300,000	600,000
Depreciation	62,100,000	78,600,000	82,000,000.0
Asset acquisition [Member]
Product Warranty Liability [Line Items]
Standard Product Warranty Accrual, Additions from Business Acquisition	$ 2,800,000	$ 0	$ 0

Additions made to capitalized computer software costs during the period.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Amount of increase in the standard product warranty accrual from a business acquisition. Excludes extended product warranties.

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