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v3.25.1

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 278,631 | $ 255,108 | $ 520,062 | $ 449,125
Oil and gas (excludes petrochemical) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 101,167 | 103,820 | 196,846 | 187,456
Petrochemical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43,704 | 50,070 | 76,887 | 78,437
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 47,502 | 121,579 | 88,205
Commercial and other industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40,369 | 34,894 | 84,669 | 59,566
Light rail traction power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,008 | 4,517 | 18,236 | 8,862
All others |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13,044 | 14,305 | 21,845 | 26,599
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 227,834 | 216,933 | 425,606 | 376,793
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,970 | 24,160 | 65,664 | 44,510
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,897 | 8,265 | 11,425 | 14,797
Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,282 | 2,803 | 12,840 | 6,078
Mexico, Central and South America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,002 | 2,159 | 1,301 | 4,816
Asia/Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1,646 | $ 788 | $ 3,226 | $ 2,131

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