Goodwill and Intangible Assets - Summary of Gross Carrying Amounts and Accumulated Amortization of Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 196,144	$ 193,098
Accumulated Amortization	(192,269)	(183,398)
Net Carrying Amount	3,875	9,700
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	106,713	104,498
Accumulated Amortization	(102,942)	(95,315)
Net Carrying Amount	$ 3,771	$ 9,183
Weighted Average Remaining Life (Years)	1 year 6 months	1 year 8 months 12 days
Technology and Patents
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 89,431	$ 88,600
Accumulated Amortization	(89,327)	(88,083)
Net Carrying Amount	$ 104	$ 517
Weighted Average Remaining Life (Years)	2 months 12 days	1 year 2 months 12 days