Goodwill and Intangible Assets - Summary of Gross Carrying Amounts and Accumulated Amortization of Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 198,701	$ 196,144
Accumulated Amortization	(196,995)	(192,269)
Net Carrying Amount	1,706	3,875
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	108,659	106,713
Accumulated Amortization	(106,953)	(102,942)
Net Carrying Amount	$ 1,706	$ 3,771
Weighted Average Remaining Life (Years)	6 months	1 year 6 months
Technology and Patents
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 90,042	$ 89,431
Accumulated Amortization	(90,042)	(89,327)
Net Carrying Amount	$ 0	$ 104
Weighted Average Remaining Life (Years)		2 months 12 days