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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 241,431	$ 194,017
Oil and gas (excludes petrochemical)
Disaggregation of Revenue [Line Items]
Revenues	95,679	83,636
Petrochemical
Disaggregation of Revenue [Line Items]
Revenues	33,183	28,367
Electric utility
Disaggregation of Revenue [Line Items]
Revenues	51,240	40,703
Commercial and other industrial
Disaggregation of Revenue [Line Items]
Revenues	44,300	24,672
Light rail traction power
Disaggregation of Revenue [Line Items]
Revenues	8,228	4,345
All others
Disaggregation of Revenue [Line Items]
Revenues	8,801	12,294
United States
Disaggregation of Revenue [Line Items]
Revenues	197,772	159,860
Canada
Disaggregation of Revenue [Line Items]
Revenues	31,694	20,350
Europe
Disaggregation of Revenue [Line Items]
Revenues	5,528	6,532
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	4,558	3,275
Mexico, Central and South America
Disaggregation of Revenue [Line Items]
Revenues	299	2,657
Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenues	$ 1,580	$ 1,343

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