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Revenue (Tables)
 6 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Summary of Contract Asset and Liabilities
Contract assets and liabilities as of March 31, 2022 and September 30, 2021 are summarized below (in thousands):
March 31, 2022September 30, 2021
Contract assets$58,553 $54,199 
Contract liabilities(56,706)(42,433)
Net contract asset$1,847 $11,766 
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, 2022 and 2021 (in thousands):
Three months ended March 31,Six months ended March 31,
2022202120222021
United States$86,992 $87,939 $169,137 $168,525 
Canada22,053 17,734 37,178 31,825 
Europe, Middle East and Africa15,551 10,937 23,381 19,193 
Asia/Pacific1,646 2,009 2,590 4,725 
Mexico, Central and South America1,612 97 2,137 1,023 
     Total revenues by geographic destination$127,854 $118,716 $234,423 $225,291 

Three months ended March 31,Six months ended March 31,
2022202120222021
Oil and gas (excludes petrochemical)$53,634 $50,142 $96,655 $90,171 
Petrochemical18,853 10,196 36,081 19,361 
Electric utility30,374 28,452 51,907 56,622 
Traction power10,054 15,140 21,426 28,501 
All others14,939 14,786 28,354 30,636 
     Total revenues by market sector$127,854 $118,716 $234,423 $225,291