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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 151,570 | $ 123,737 | $ 285,720 | $ 233,088
Oil and gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 51,954 | 56,022 | 111,948 | 105,598
Petrochemical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47,337 | 22,523 | 77,763 | 42,301
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,255 | 20,383 | 47,270 | 39,641
Traction power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13,944 | 6,025 | 22,295 | 11,034
All others |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,080 | 18,784 | 26,444 | 34,514
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 121,432 | 102,406 | 228,510 | 192,304
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,407 | 15,094 | 29,861 | 24,809
Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,816 | 5,508 | 18,982 | 10,949
Asia/Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,456 | 729 | 7,142 | 4,473
Mexico, Central and South America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 459 | $ 0 | $ 1,225 | $ 553

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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