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Revenue (Tables)
 9 Months Ended
Jun. 30, 2022
Revenue from Contract with Customer [Abstract]  
Summary of Contract Asset and Liabilities
Contract assets and liabilities as of June 30, 2022 and September 30, 2021 are summarized below (in thousands):
June 30, 2022September 30, 2021
Contract assets$68,245 $54,199 
Contract liabilities(66,582)(42,433)
Net contract asset$1,663 $11,766 
Disaggregation of Revenue
The following tables present our disaggregated revenue by geographic destination and market sector for the three and nine months ended June 30, 2022 and 2021 (in thousands):
Three months ended June 30,Nine months ended June 30,
2022202120222021
United States$102,931 $88,412 $272,069 $256,937 
Canada23,599 16,529 60,777 48,354 
Europe, Middle East and Africa6,697 8,926 30,078 28,120 
Asia/Pacific1,645 1,651 4,235 6,376 
Mexico, Central and South America611 295 2,748 1,318 
     Total revenues by geographic destination$135,483 $115,813 $369,907 $341,105 

Three months ended June 30,Nine months ended June 30,
2022202120222021
Oil and gas (excludes petrochemical)$58,669 $49,272 $155,324 $139,443 
Petrochemical15,187 15,365 51,268 34,725 
Electric utility30,173 26,175 82,079 82,797 
Traction power9,775 13,821 31,200 42,322 
All others21,679 11,180 50,036 41,818 
     Total revenues by market sector$135,483 $115,813 $369,907 $341,105