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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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