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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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