Summary of Significant Accounting Policies (Inventories) (Details) - USD ($)	Sep. 30, 2020	Sep. 30, 2019
Inventories
Percentage of inventories determined by LIFO method	16.00%	30.00%
Inventory, Net [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 167,600,000	$ 120,500,000
Inventory, Work in Process, Net of Reserves	48,400,000	42,400,000
Inventory, Raw Materials, Net of Reserves	136,000,000.0	106,700,000
Total	352,000,000.0	269,600,000
Excess of Replacement or Current Costs over Stated LIFO Value	$ 5,500,000	$ 300,000

The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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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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