Goodwill and Intangible Assets - Components of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Cost	$ 515,636	$ 348,982
Accumulated Amortization	221,335	170,581
Net Book Value	294,301	178,401
Patents
Finite-Lived Intangible Assets [Line Items]
Cost	1,226	1,225
Accumulated Amortization	1,175	1,106
Net Book Value	51	119
Completed Technology
Finite-Lived Intangible Assets [Line Items]
Cost	215,430	99,525
Accumulated Amortization	56,021	37,991
Net Book Value	159,409	61,534
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Cost	6,630	400
Accumulated Amortization	1,445	41
Net Book Value	5,185	359
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Cost	681	681
Accumulated Amortization	568	439
Net Book Value	113	242
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Cost	290,800	246,949
Accumulated Amortization	161,257	130,802
Net Book Value	129,543	116,147
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Cost	869	202
Accumulated Amortization	$ 869	$ 202