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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 255,108 | $ 171,444 | $ 449,125 | $ 298,302
Oil and gas (excludes petrochemical) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 103,820 | 62,597 | 187,456 | 106,107
Petrochemical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 50,070 | 25,887 | 78,437 | 48,377
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47,502 | 42,668 | 88,205 | 71,075
Commercial and other industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34,894 | 22,270 | 59,566 | 39,320
Light rail traction power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,517 | 7,317 | 8,862 | 14,389
All others |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,305 | 10,705 | 26,599 | 19,034
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 216,933 | 134,161 | 376,793 | 234,273
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,160 | 21,995 | 44,510 | 40,491
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,265 | 7,953 | 14,797 | 12,087
Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,803 | 4,004 | 6,078 | 6,429
Mexico, Central and South America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,159 | 1,543 | 4,816 | 2,458
Asia/Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 788 | $ 1,788 | $ 2,131 | $ 2,564

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