Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets:
Defined benefit plans, other postretirement	$ 4,144	$ 5,364
Foreign net operating loss carryforwards	3,449	2,110
Inventory	57,102	51,011
Stock-based and other compensation	42,428	36,343
Deferred revenue net of unbilled receivables	49,491	46,002
Other reserves	8,017	10,619
Tax credits and incentives	25,623	22,756
Lease obligations	7,150	5,818
Other	3,402	7,936
Valuation allowance	(2,537)	(4,138)
Total deferred tax assets, net of valuation allowance	198,269	183,821
Deferred tax liabilities:
Goodwill and intangibles - net	(187,988)	(210,911)
Property, plant and equipment	(100,215)	(105,724)
Right of use assets	(7,013)	(5,497)
Defined benefit plans, pension	(3,969)	(2,837)
Other	(2,832)	(2,722)
Total deferred tax liabilities	(302,017)	(327,691)
Net deferred tax liabilities	$ (103,748)	$ (143,870)