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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Deferred tax assets:
Defined benefit plans, other postretirement	$ 6,238	$ 6,535
Foreign net operating loss carryforwards	6,106	6,836
Inventory	53,867	51,740
Stock-based and other compensation	35,919	45,839
Defined benefit plans, pension	5,624	11,399
Deferred revenue net of unbilled receivables	39,990	32,310
Other reserves	10,119	11,571
Tax credits and incentives	14,340	13,580
Lease obligations	5,764
Other	9,223	5,611
Valuation allowance	(1,833)	(3,638)
Total deferred tax assets, net of valuation allowance	185,357	181,783
Deferred tax liabilities:
Goodwill and intangibles - net	(218,900)	(212,926)
Property, plant and equipment	(107,862)	(97,469)
Right of use assets	(4,837)
Other	(2,673)	(4,589)
Total deferred tax liabilities	(334,272)	(314,984)
Net deferred tax liabilities	$ (148,915)	$ (133,201)

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