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Revenue (Tables)
 9 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Contract Asset and Liabilities
Contract assets and liabilities as of June 30, 2021 and September 30, 2020 are summarized below (in thousands):
June 30, 2021September 30, 2020
Contract assets$50,827 $50,995 
Contract liabilities(43,140)(79,445)
Net contract asset (liability)$7,687 $(28,450)
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, 2021 and 2020 (in thousands):
Three months ended June 30,Nine months ended June 30,
2021202020212020
United States$88,412 $89,499 $256,937 $318,009 
Canada16,529 16,970 48,354 46,831 
Europe, Middle East and Africa8,926 6,422 28,120 25,404 
Asia/Pacific1,651 4,643 6,376 11,784 
Mexico, Central and South America295 528 1,318 1,753 
     Total revenues by geographic destination$115,813 $118,062 $341,105 $403,781 

Three months ended June 30,Nine months ended June 30,
2021202020212020
Oil and gas$49,272 $45,851 $139,443 $157,798 
Petrochemical15,365 29,293 34,725 107,057 
Electric utility26,175 16,725 82,797 63,994 
Traction power13,821 9,122 42,322 31,417 
All others11,180 17,071 41,818 43,515 
     Total revenues by market sector$115,813 $118,062 $341,105 $403,781