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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 699,308 | $ 532,582 | $ 470,559
Oil and gas (excludes petrochemical) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 273,117 | 215,235 | 187,660
Petrochemical |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 94,188 | 66,538 | 58,986
Electric utility |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 158,400 | 122,361 | 111,244
Traction power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 28,112 | 44,930 | 59,106
Commercial and other industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 103,966 | 56,448 | 27,065
All others |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 41,525 | 27,070 | 26,498
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 557,934 | 404,973 | 351,422
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 84,090 | 81,218 | 68,655
Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 14,998 | 20,712 | 26,615
Asia/Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 6,188 | 4,885 | 8,889
Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 26,699 | 17,699 | 13,027
Mexico, Central and South America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 9,399 | $ 3,095 | $ 1,951

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