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Revenue (Tables)
 3 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Contract Asset and Liabilities
Contract assets and liabilities as of December 31, 2021 and September 30, 2021 are summarized below (in thousands):
December 31, 2021September 30, 2021
Contract assets$67,904 $54,199 
Contract liabilities(49,396)(42,433)
Net contract asset$18,508 $11,766 
Disaggregation of Revenue
The following tables present our disaggregated revenue by geographic destination and market sector for the three months ended December 31, 2021 and 2020 (in thousands):
Three months ended December 31,
20212020
United States$82,145 $80,586 
Canada15,125 14,091 
Europe, Middle East and Africa7,830 8,256 
Asia/Pacific944 2,716 
Mexico, Central and South America525 926 
     Total revenues by geographic destination$106,569 $106,575 

Three months ended December 31,
20212020
Oil and gas (excludes petrochemical)$43,021 $40,028 
Petrochemical17,228 9,165 
Electric utility21,533 28,171 
Traction power11,372 13,361 
All others13,415 15,850 
     Total revenues by market sector$106,569 $106,575