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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. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 202,548 | $ 239,516 | $ 222,787 | $ 262,236 | $ 200,660 | $ 208,158 | $ 196,329 | $ 205,283 | $ 927,087 | $ 810,430 | $ 863,538
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 526,465 | 461,945 | 518,123
Trasmission & Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 212,433 | 194,503 | 164,072
Power Generation [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 188,189 | $ 153,982 | $ 181,343

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