Goodwill and Intangible Assets - Summary of Gross Carrying Amounts and Accumulated Amortization of Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 193,098	$ 201,223
Accumulated Amortization	(183,398)	(175,875)
Net Carrying Amount	9,700	25,348
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	104,498	110,485
Accumulated Amortization	(95,315)	(88,638)
Net Carrying Amount	$ 9,183	$ 21,847
Weighted Average Remaining Life (Years)	1 year 8 months 12 days	2 years 2 months 12 days
Technology and Patents
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 88,600	$ 90,738
Accumulated Amortization	(88,083)	(87,237)
Net Carrying Amount	$ 517	$ 3,501
Weighted Average Remaining Life (Years)	1 year 2 months 12 days	10 months 24 days