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Operating segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | Feb. 29, 2016
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 200,660 | $ 208,158 | $ 196,329 | $ 205,283 | $ 184,266 | $ 228,116 | $ 200,790 | $ 250,366 | $ 810,430 | $ 863,538 | $ 889,400
Operating Income (Loss) |  |  |  |  |  |  |  |  | 48,248 | 98,908 | 120,295
Depreciation |  |  |  |  |  |  |  |  | 50,526 | 50,357 | 47,417
Payments to acquire property, plant, equipment and acquire businesses, net of cash |  |  |  |  |  |  |  |  | 74,397 | 64,113 | 100,445
Assets | 1,028,209 |  |  |  | 978,354 |  |  |  | 1,028,209 | 978,354 |
Property, Plant and Equipment, Net | 216,855 |  |  |  | 228,610 |  |  |  | 216,855 | 228,610 |
Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 421,033 | 488,002 | 487,038
Operating Income (Loss) |  |  |  |  |  |  |  |  | (1,766) | 52,577 | 56,478
Depreciation |  |  |  |  |  |  |  |  | 19,996 | 19,624 | 19,131
Payments to acquire property, plant, equipment and acquire businesses, net of cash |  |  |  |  |  |  |  |  | 32,903 | 31,474 | 12,863
Assets | 554,866 |  |  |  | 536,557 |  |  |  | 554,866 | 536,557 |
Galvanizing Services [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 389,397 | 375,536 | 402,362
Operating Income (Loss) |  |  |  |  |  |  |  |  | 84,332 | 79,033 | 94,766
Depreciation |  |  |  |  |  |  |  |  | 28,617 | 28,650 | 26,863
Payments to acquire property, plant, equipment and acquire businesses, net of cash |  |  |  |  |  |  |  |  | 39,474 | 32,099 | 86,724
Assets | 460,575 |  |  |  | 428,330 |  |  |  | 460,575 | 428,330 |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (34,318) | (32,702) | (30,949)
Depreciation |  |  |  |  |  |  |  |  | 1,913 | 2,083 | 1,423
Payments to acquire property, plant, equipment and acquire businesses, net of cash |  |  |  |  |  |  |  |  | 2,020 | 540 | 858
Assets | 12,768 |  |  |  | 13,467 |  |  |  | 12,768 | 13,467 |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 654,336 | 705,976 | 710,767
Property, Plant and Equipment, Net | 194,418 |  |  |  | 205,079 |  |  |  | 194,418 | 205,079 |
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net | 4,183 |  |  |  | 5,529 |  |  |  | 4,183 | 5,529 |
Geography Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (1,186) | (156) | (1,199)
CANADA |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net | $ 18,254 |  |  |  | $ 18,002 |  |  |  | 18,254 | 18,002 |
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 157,280 | $ 157,718 | $ 179,832

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