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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 1,104,318	$ 1,012,356	$ 699,308
Oil and gas (excludes petrochemical)
Disaggregation of Revenue [Line Items]
Revenues	406,565	417,170	273,117
Electric utility
Disaggregation of Revenue [Line Items]
Revenues	278,988	186,547	158,400
Commercial and other industrial
Disaggregation of Revenue [Line Items]
Revenues	178,222	149,899	103,966
Petrochemical
Disaggregation of Revenue [Line Items]
Revenues	151,166	185,606	94,188
Light rail traction power
Disaggregation of Revenue [Line Items]
Revenues	41,264	22,019	28,112
All others
Disaggregation of Revenue [Line Items]
Revenues	48,113	51,115	41,525
United States
Disaggregation of Revenue [Line Items]
Revenues	880,222	846,526	557,934
Canada
Disaggregation of Revenue [Line Items]
Revenues	157,191	106,521	84,090
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	27,440	13,440	14,998
Europe
Disaggregation of Revenue [Line Items]
Revenues	25,072	31,388	26,699
Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenues	9,283	6,850	6,188
Mexico, Central and South America
Disaggregation of Revenue [Line Items]
Revenues	$ 5,110	$ 7,631	$ 9,399

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