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Operating segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2015
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 184,266 | $ 228,116 | $ 200,790 | $ 250,366 | $ 207,694 | $ 241,596 | $ 199,670 | $ 240,440 | $ 863,538 | $ 889,400 | $ 819,692
Segment Operating income |  |  |  |  |  |  |  |  | 98,908 | 120,295 | 107,902
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  |  |  |  |  | 76 | (327) | (2,525)
Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |  | 1,197 | (3,092) | (2,659)
Interest expense |  |  |  |  |  |  |  |  | 14,732 | 15,155 | 16,561
Total Operating Income |  |  |  |  |  |  |  |  | 85,297 | 102,375 | 91,207
Depreciation and amortization |  |  |  |  |  |  |  |  | 50,357 | 47,417 | 46,089
Expenditures for acquisitions, net of cash, and property, plant and equipment |  |  |  |  |  |  |  |  | 64,113 | 100,445 | 40,895
Assets | 978,354 |  |  |  | 988,201 |  |  |  | 978,354 | 988,201 | 925,315
Goodwill | 306,579 |  |  |  | 292,527 |  |  |  | 306,579 | 292,527 | 279,074
Property, Plant and Equipment, Net | 228,610 |  |  |  | 226,333 |  |  |  | 228,610 | 226,333 | 196,583
Galvanizing Services [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 375,536 | 402,362 | 358,348
Segment Operating income |  |  |  |  |  |  |  |  | 79,033 | 94,766 | 88,562
Depreciation and amortization |  |  |  |  |  |  |  |  | 28,650 | 26,863 | 23,964
Expenditures for acquisitions, net of cash, and property, plant and equipment |  |  |  |  |  |  |  |  | 32,099 | 86,724 | 26,928
Assets | 428,330 |  |  |  | 436,471 |  |  |  | 428,330 | 436,471 | 378,823
Goodwill | 109,980 |  |  |  | 109,314 |  |  |  | 109,980 | 109,314 | 95,538
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Segment Operating income |  |  |  |  |  |  |  |  | (32,702) | (30,949) | (20,440)
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,083 | 1,423 | 1,400
Expenditures for acquisitions, net of cash, and property, plant and equipment |  |  |  |  |  |  |  |  | 540 | 858 | 3,320
Assets | 13,467 |  |  |  | 45,461 |  |  |  | 13,467 | 45,461 | 34,844
Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 488,002 | 487,038 | 461,344
Segment Operating income |  |  |  |  |  |  |  |  | 52,577 | 56,478 | 39,780
Depreciation and amortization |  |  |  |  |  |  |  |  | 19,624 | 19,131 | 20,725
Expenditures for acquisitions, net of cash, and property, plant and equipment |  |  |  |  |  |  |  |  | 31,474 | 12,863 | 10,647
Assets | 536,557 |  |  |  | 506,269 |  |  |  | 536,557 | 506,269 | 511,648
Goodwill | 196,599 |  |  |  | 183,213 |  |  |  | 196,599 | 183,213 | 183,536
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 705,976 | 710,767 | 634,549
Property, Plant and Equipment, Net | 205,079 |  |  |  | 204,587 |  |  |  | 205,079 | 204,587 | 173,712
International [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 157,718 | 179,832 | 189,855
Geography Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (156) | (1,199) | (4,712)
CANADA |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net | 18,002 |  |  |  | 17,868 |  |  |  | 18,002 | 17,868 | 20,289
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Operations and assets by segment |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net | $ 5,529 |  |  |  | $ 3,878 |  |  |  | $ 5,529 | $ 3,878 | $ 2,582

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