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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Jan. 31, 2018 USD ($) item | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($)
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Operating segment | item |  |  |  |  |  |  |  |  | 1 |  |
Revenues | $ 169,578 | $ 232,945 | $ 259,803 | $ 230,489 | $ 206,760 | $ 175,444 | $ 162,495 | $ 130,348 | $ 892,815 | $ 675,047 | $ 413,275
Cost of revenues |  |  |  |  |  |  |  |  | 743,490 | 528,336 | 313,810
Gross profit | 20,104 | 37,718 | 51,407 | 40,096 | 37,819 | 36,578 | 44,012 | 28,302 | 149,325 | 146,711 | 99,465
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 41,764 | 32,478 | 25,060
Impairment loss |  |  |  |  |  |  |  |  | 584 | 1,979 |
Income (loss) from operations | 8,163 | 27,599 | 40,608 | 30,607 | 29,770 | 26,730 | 34,499 | 21,255 | 106,977 | 112,254 | 74,405
Other income, net |  |  |  |  |  |  |  |  | 5,648 | 2,278 | 1,101
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 112,625 | 114,532 | 75,506
Income tax expense |  |  |  |  |  |  |  |  | 40,279 | 37,106 | 25,302
Net income | 7,050 | $ 17,229 | $ 27,318 | $ 20,749 | 20,781 | $ 19,226 | $ 23,299 | $ 14,120 | 72,346 | 77,426 | 50,204
Depreciation |  |  |  |  |  |  |  |  | 2,779 | 2,043 | 779
Amortization of intangibles |  |  |  |  |  |  |  |  | 1,032 | 1,163 | 531
Property, plant and equipment additions |  |  |  |  |  |  |  |  | 4,826 | 2,811 | 3,118
Current assets | 545,751 |  |  |  | 587,949 |  |  |  | 545,751 | 587,949 |
Current liabilities | 243,986 |  |  |  | 350,724 |  |  |  | 243,986 | 350,724 |
Goodwill | 34,329 |  |  |  | 34,913 |  |  |  | 34,329 | 34,913 | 37,405
Total assets | 603,393 |  |  |  | 644,488 |  |  |  | 603,393 | 644,488 | 409,791
Power Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 814,544 | 586,628 | 387,636
Cost of revenues |  |  |  |  |  |  |  |  | 675,362 | 452,599 | 290,823
Gross profit |  |  |  |  |  |  |  |  | 139,182 | 134,029 | 96,813
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 23,356 | 17,588 | 15,303
Impairment loss |  |  |  |  |  |  |  |  |  | 1,979 |
Income (loss) from operations |  |  |  |  |  |  |  |  | 115,826 | 114,462 | 81,510
Other income, net |  |  |  |  |  |  |  |  | 5,391 | 2,145 | 827
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 121,217 | 116,607 | 82,337
Depreciation |  |  |  |  |  |  |  |  | 885 | 665 | 433
Amortization of intangibles |  |  |  |  |  |  |  |  | 350 | 350 | 415
Property, plant and equipment additions |  |  |  |  |  |  |  |  | 1,362 | 1,005 | 2,985
Current assets | 465,730 |  |  |  |  |  |  |  | 465,730 |  |
Current liabilities | 233,385 |  |  |  |  |  |  |  | 233,385 |  |
Goodwill | 20,548 |  |  |  | 20,548 |  |  |  | 20,548 | 20,548 | 22,525
Total assets | 493,576 |  |  |  | 488,431 |  |  |  | 493,576 | 488,431 | 274,627
Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 65,303 | 78,994 | 15,260
Cost of revenues |  |  |  |  |  |  |  |  | 58,283 | 68,354 | 15,527
Gross profit |  |  |  |  |  |  |  |  | 7,020 | 10,640 | (267)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 7,401 | 6,264 | 1,151
Impairment loss |  |  |  |  |  |  |  |  | 584 |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | (965) | 4,376 | (1,418)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (965) | 4,376 | (1,418)
Depreciation |  |  |  |  |  |  |  |  | 1,607 | 1,165 | 172
Amortization of intangibles |  |  |  |  |  |  |  |  | 682 | 813 | 116
Property, plant and equipment additions |  |  |  |  |  |  |  |  | 2,837 | 1,238 | 28
Current assets | 16,651 |  |  |  |  |  |  |  | 16,651 |  |
Current liabilities | 9,013 |  |  |  |  |  |  |  | 9,013 |  |
Goodwill | 13,781 |  |  |  | 14,365 |  |  |  | 13,781 | 14,365 | 14,880
Total assets | 44,868 |  |  |  | 47,316 |  |  |  | 44,868 | 47,316 | 52,436
Telecom Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 12,968 | 9,425 | 10,379
Cost of revenues |  |  |  |  |  |  |  |  | 9,845 | 7,383 | 7,460
Gross profit |  |  |  |  |  |  |  |  | 3,123 | 2,042 | 2,919
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 1,395 | 1,430 | 1,323
Income (loss) from operations |  |  |  |  |  |  |  |  | 1,728 | 612 | 1,596
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 1,728 | 612 | 1,596
Depreciation |  |  |  |  |  |  |  |  | 274 | 201 | 162
Property, plant and equipment additions |  |  |  |  |  |  |  |  | 625 | 563 | 100
Current assets | 3,672 |  |  |  |  |  |  |  | 3,672 |  |
Current liabilities | 758 |  |  |  |  |  |  |  | 758 |  |
Total assets | 4,934 |  |  |  | 4,318 |  |  |  | 4,934 | 4,318 | 1,885
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 9,612 | 7,196 | 7,283
Income (loss) from operations |  |  |  |  |  |  |  |  | (9,612) | (7,196) | (7,283)
Other income, net |  |  |  |  |  |  |  |  | 257 | 133 | 274
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (9,355) | (7,063) | (7,009)
Depreciation |  |  |  |  |  |  |  |  | 13 | 12 | 12
Property, plant and equipment additions |  |  |  |  |  |  |  |  | 2 | 5 | 5
Current assets | 59,698 |  |  |  |  |  |  |  | 59,698 |  |
Current liabilities | 830 |  |  |  |  |  |  |  | 830 |  |
Total assets | $ 60,015 |  |  |  | $ 104,423 |  |  |  | 60,015 | 104,423 | $ 80,843
Intercompany Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 2,200 | $ 1,000 |

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