Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Deferred tax assets:
Defined benefit plans, other postretirement	$ 3,695	$ 3,769
Foreign net operating loss carryforwards	6,547	3,748
Inventory	77,013	68,034
Stock-based and other compensation	48,360	51,099
Deferred revenue net of unbilled receivables	43,400	46,283
Other reserves	7,850	8,244
Tax credits and incentives	30,886	28,319
Lease obligations	6,851	6,103
Other	4,622	4,476
Valuation allowance	(5,983)	(3,827)
Capitalized research and development costs	63,080	37,328
Total deferred tax assets, net of valuation allowance	286,321	253,576
Deferred tax liabilities:
Goodwill and intangibles - net	(198,012)	(194,891)
Property, plant and equipment	(97,340)	(99,547)
Right of use assets	(6,691)	(5,948)
Defined benefit plans, pension	(13,133)	(9,892)
Other	(8,612)	(17,568)
Total deferred tax liabilities	(323,788)	(327,846)
Net deferred tax liabilities	$ (37,467)	$ (74,270)