Segment Information - Schedule of Revenues from External Customers by Geographical Areas (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Reportable segments | segment	1
Revenues	$ 699,308	$ 532,582	$ 470,559
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	557,934	404,973	351,422
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	84,090	81,218	68,655
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,998	20,712	26,615
Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	6,188	4,885	8,889
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	26,699	17,699	13,027
Mexico, Central and South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 9,399	$ 3,095	$ 1,951