Goodwill and Other Intangible Assets - Summary of Gross Carrying Amounts and Accumulated Amortization of Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 195,056	$ 198,701
Accumulated Amortization	(193,997)	(196,995)
Net Carrying Amount	1,059	1,706
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	106,043	108,659
Accumulated Amortization	(104,984)	(106,953)
Net Carrying Amount	$ 1,059	$ 1,706
Weighted Average Remaining Life (Years)	2 months 12 days	6 months
Technology and Patents
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 89,013	$ 90,042
Accumulated Amortization	$ (89,013)	$ (90,042)