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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Deferred tax assets:
Defined benefit plans, other postretirement	$ 3,453	$ 3,695
Foreign net operating loss carryforwards	2,564	6,547
Inventory	81,241	77,013
Stock-based and other compensation	48,764	48,360
Deferred revenue net of unbilled receivables	45,144	43,400
Other reserves	11,841	7,850
Tax credits and incentives	32,171	30,886
Lease obligations	6,171	6,851
Other	6,668	4,622
Valuation allowance	(4,080)	(5,983)
Capitalized research and development costs	83,582	63,080
Total deferred tax assets, net of valuation allowance	317,519	286,321
Deferred tax liabilities:
Goodwill and intangibles - net	(182,717)	(198,012)
Property, plant and equipment	(94,238)	(97,340)
Right of use assets	(6,037)	(6,691)
Defined benefit plans, pension	(15,657)	(13,133)
Other	(7,804)	(8,612)
Total deferred tax liabilities	(306,453)	(323,788)
Net deferred tax assets (liabilities)	$ 11,066
Net deferred tax assets (liabilities)		$ (37,467)

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