Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Deferred tax assets:
Defined benefit plans, other postretirement	$ 3,769	$ 4,144
Foreign net operating loss carryforwards	3,748	3,449
Inventory	68,034	57,102
Stock-based and other compensation	51,099	42,428
Deferred revenue net of unbilled receivables	46,283	49,491
Other reserves	8,244	8,017
Tax credits and incentives	28,319	25,623
Lease obligations	6,103	7,150
Other	4,476	3,402
Valuation allowance	(3,827)	(2,537)
Capitalized research and development costs	37,328
Total deferred tax assets, net of valuation allowance	253,576	198,269
Deferred tax liabilities:
Goodwill and intangibles - net	(194,891)	(187,988)
Property, plant and equipment	(99,547)	(100,215)
Right of use assets	(5,948)	(7,013)
Defined benefit plans, pension	(9,892)	(3,969)
Other	(17,568)	(2,832)
Total deferred tax liabilities	(327,846)	(302,017)
Net deferred tax liabilities	$ (74,270)	$ (103,748)