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Revenue (Tables) | 6 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Summary of Contract Asset and Liabilities | Contract assets and liabilities as of March 31, 2021 and September 30, 2020 are summarized below (in thousands):
| March 31, 2021 |  | September 30, 2020
Contract assets | $ | 42,728 |  |  | $ | 50,995 |
Contract liabilities | (54,098) |  |  | (79,445) |
Net contract liability | $ | (11,370) |  |  | $ | (28,450) |
Disaggregation of Revenue | The following tables present our disaggregated revenue by geographic destination and market sector for the six months ended March 31, 2021 and 2020 (in thousands):
| Three months ended March 31, |  | Six months ended March 31,
| 2021 |  | 2020 |  | 2021 |  | 2020
United States | $ | 87,939 |  |  | $ | 121,432 |  |  | $ | 168,525 |  |  | $ | 228,510 |
Canada | 17,734 |  |  | 15,407 |  |  | 31,825 |  |  | 29,861 |
Europe, Middle East and Africa | 10,937 |  |  | 8,816 |  |  | 19,193 |  |  | 18,982 |
Asia/Pacific | 2,009 |  |  | 5,456 |  |  | 4,725 |  |  | 7,142 |
Mexico, Central and South America | 97 |  |  | 459 |  |  | 1,023 |  |  | 1,225 |
Total revenues by geographic destination | $ | 118,716 |  |  | $ | 151,570 |  |  | $ | 225,291 |  |  | $ | 285,720 |
| Three months ended March 31, |  | Six months ended March 31,
| 2021 |  | 2020 |  | 2021 |  | 2020
Oil and gas | $ | 50,142 |  |  | $ | 51,954 |  |  | $ | 90,171 |  |  | $ | 111,948 |
Petrochemical | 10,196 |  |  | 47,337 |  |  | 19,361 |  |  | 77,763 |
Electric utility | 28,452 |  |  | 24,255 |  |  | 56,622 |  |  | 47,270 |
Traction power | 15,140 |  |  | 13,944 |  |  | 28,501 |  |  | 22,295 |
All others | 14,786 |  |  | 14,080 |  |  | 30,636 |  |  | 26,444 |
Total revenues by market sector | $ | 118,716 |  |  | $ | 151,570 |  |  | $ | 225,291 |  |  | $ | 285,720 |

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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=121604090&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=121604090&loc=SL49130545-203045 + Details
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