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Summary of Significant Accounting Policies - Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 29, 2020 | Feb. 28, 2019 | Feb. 28, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 245,365 | $ 291,139 | $ 236,190 | $ 289,123 | $ 202,548 | $ 239,516 | $ 222,787 | $ 262,236 | $ 1,061,817 | $ 927,087 | $ 810,430
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 605,236 | 526,465 | 461,945
Trasmission & Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 254,836 | 212,433 | 194,503
Power Generation [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 201,745 | $ 188,189 | $ 153,982

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