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Revenue (Tables) | 3 Months Ended
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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, 2021 |  | September 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, |  |
| 2021 |  | 2020 |  |  |  |
United States | $ | 82,145 |  |  | $ | 80,586 |  |  |  |  |
Canada | 15,125 |  |  | 14,091 |  |  |  |  |
Europe, Middle East and Africa | 7,830 |  |  | 8,256 |  |  |  |  |
Asia/Pacific | 944 |  |  | 2,716 |  |  |  |  |
Mexico, Central and South America | 525 |  |  | 926 |  |  |  |  |
Total revenues by geographic destination | $ | 106,569 |  |  | $ | 106,575 |  |  |  |  |
| Three months ended December 31, |  |
| 2021 |  | 2020 |  |  |  |
Oil and gas (excludes petrochemical) | $ | 43,021 |  |  | $ | 40,028 |  |  |  |  |
Petrochemical | 17,228 |  |  | 9,165 |  |  |  |  |
Electric utility | 21,533 |  |  | 28,171 |  |  |  |  |
Traction power | 11,372 |  |  | 13,361 |  |  |  |  |
All others | 13,415 |  |  | 15,850 |  |  |  |  |
Total revenues by market sector | $ | 106,569 |  |  | $ | 106,575 |  |  |  |  |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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