Income Taxes (Schedule of Deferred Taxes) (Details) - USD ($)	Sep. 30, 2020	Sep. 30, 2019
Deferred tax assets:
Employee benefit accruals	$ 48,300,000	$ 42,900,000
Inventory	14,700,000	10,000,000.0
Net operating loss carryforwards	69,700,000	69,800,000
Tax credit carryforwards	26,400,000	22,600,000
Other, net	36,200,000	25,300,000
Deferred tax assets, gross	214,100,000	170,600,000
Less: Valuation allowance	(50,800,000)	(45,000,000.0)
Total deferred tax assets	163,300,000	125,600,000
Deferred tax liabilities:
Depreciation	(19,200,000)	(14,500,000)
Amortization	(201,000,000.0)	(215,400,000)
Deferred Tax Liabilities, Leasing Arrangements	(17,600,000)	0
Other, net	(5,600,000)	(5,600,000)
Total deferred tax liabilities	(243,400,000)	(235,500,000)
Deferred tax liability - net	$ (80,100,000)	$ (109,900,000)