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Revenue (Tables)
 6 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Summary of Contract Asset and Liabilities
Contract assets and liabilities as of March 31, 2024 and September 30, 2023 are summarized below (in thousands):
March 31, 2024September 30, 2023
Contract assets$75,010 $60,621 
Contract liabilities(315,699)(279,796)
Net contract liability$(240,689)$(219,175)
Disaggregation of Revenue
The following tables present our disaggregated revenue by geographic destination and market sector for the three and six months ended March 31, 2024 and 2023 (in thousands):
Three months ended March 31,Six months ended March 31,
2024202320242023
United States$216,933 $134,161 $376,793 $234,273 
Canada24,160 21,995 44,510 40,491 
Europe8,265 7,953 14,797 12,087 
Middle East and Africa2,803 4,004 6,078 6,429 
Mexico, Central and South America2,159 1,543 4,816 2,458 
Asia/Pacific788 1,788 2,131 2,564 
     Total revenues by geographic destination$255,108 $171,444 $449,125 $298,302 

Three months ended March 31,Six months ended March 31,
2024202320242023
Oil and gas (excludes petrochemical)$103,820 $62,597 $187,456 $106,107 
Petrochemical50,070 25,887 78,437 48,377 
Electric utility47,502 42,668 88,205 71,075 
Commercial and other industrial34,894 22,270 59,566 39,320 
Light rail traction power4,517 7,317 8,862 14,389 
All others14,305 10,705 26,599 19,034 
     Total revenues by market sector$255,108 $171,444 $449,125 $298,302