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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 1,012,356	$ 699,308	$ 532,582
Oil and gas (excludes petrochemical)
Disaggregation of Revenue [Line Items]
Revenues	417,170	273,117	215,235
Petrochemical
Disaggregation of Revenue [Line Items]
Revenues	185,606	94,188	66,538
Electric utility
Disaggregation of Revenue [Line Items]
Revenues	186,547	158,400	122,361
Commercial and other industrial
Disaggregation of Revenue [Line Items]
Revenues	149,899	103,966	56,448
Light rail traction power
Disaggregation of Revenue [Line Items]
Revenues	22,019	28,112	44,930
All others
Disaggregation of Revenue [Line Items]
Revenues	51,115	41,525	27,070
United States
Disaggregation of Revenue [Line Items]
Revenues	846,526	557,934	404,973
Canada
Disaggregation of Revenue [Line Items]
Revenues	106,521	84,090	81,218
Europe
Disaggregation of Revenue [Line Items]
Revenues	31,388	26,699	17,699
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	13,440	14,998	20,712
Mexico, Central and South America
Disaggregation of Revenue [Line Items]
Revenues	7,631	9,399	3,095
Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenues	$ 6,850	$ 6,188	$ 4,885

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